Business Acquisition [Axis]
Business Acquisition [Axis]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total future minimum lease payments
Lessee, Operating Lease, Liability, to be Paid
Net income attributable to the Group
Net income attributable to the group
Net income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
PSUs based on service and EPS targets
Performance Based Grants [Member]
Performance Based Grants [Member]
Deferred tax asset
Deferred Income Tax Assets, Net
Income taxes receivable
Income Taxes Receivable, Noncurrent
Total debt
Total debt
Long-Term Debt, Gross
Schedule of Distribution of Income from Operations by Geographical Area
Shcedule Of Operating Income By Geography [Table Text Block]
Shcedule Of Operating Income By Geography
2025
Long-Term Debt, Maturity, Year Two
Payments of debt restructuring costs
Payments of Debt Restructuring Costs
Change in unearned revenue (payments on account)
Decrease in unearned revenue (payments on account)
Increase (Decrease) In Contract With Customer, Liability, Gross, Current
Increase (Decrease) In Contract With Customer, Liability, Gross, Current
Senior Secured Notes
Senior Subordinated Notes [Member]
Business Combinations
Business Combinations Policy [Policy Text Block]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt instrument, maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Variable Rate Component [Axis]
Variable Rate Component [Axis]
Variable Rate Component
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
Provision balance
Opening provision
Ending provision
Restructuring Reserve
Share repurchase costs
Adjustment to Retained Earning Share Repurchase costs
Adjustment to Retained Earning Share Repurchase costs
Cash flows from investing activities:
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Change in net balance
Increase in net balance
Change In Advance Payments Netted Against Unbilled Contracts Receivable
Change In Advance Payments Netted Against Unbilled Contracts Receivable
Items generating unrecognized tax benefits
Unrecognized Tax Benefits, Current Year Tax Positions
Unrecognized Tax Benefits, Current Year Tax Positions
Basis spread on variable rate (in percent)
Debt Instrument, Basis Spread on Variable Rate
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Schedule of Indefinite-Lived Intangible Assets [Table]
Schedule of Indefinite-Lived Intangible Assets [Table]
Exercise of share options (in shares)
Exercised (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
Percentage change in net balance
Change In Advance Payments Netted Against Unbilled Contracts Receivable, Percent
Change In Advance Payments Netted Against Unbilled Contracts Receivable, Percent
Debt instrument, interest rate
Debt Instrument, Interest Rate, Stated Percentage
Weighted average discount rate
Operating Lease, Weighted Average Discount Rate, Percent
Share-based Payment Arrangement [Abstract]
Share-Based Payment Arrangement [Abstract]
Percentage change in unbilled services (unbilled revenue)
Increase (Decrease) In Contract With Customer, Asset, Gross, Current, Percent
Increase (Decrease) In Contract With Customer, Asset, Gross, Current, Percent
Additional paid-in capital
Additional Paid in Capital, Common Stock
Long-lived assets
Long-Lived Assets
Other non-cash items
Other Noncash Income (Expense)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Net income
Net Income (Loss) Attributable to Parent
Lessee, Lease, Description [Table]
Lessee, Lease, Description [Table]
Summary of RSU and PSU activity
Summary Of Share Based Compensation Restricted Stock Units Performance Stock Units, Award, Activity [Table Text Block]
Summary Of Share Based Compensation Restricted Stock Units Performance Stock Units Award Activity [Table Text Block]
Schedule of Contractual Maturities of Debt
Schedule of Maturities of Long-Term Debt [Table Text Block]
Subsequent event type [Axis]
Subsequent Event Type [Axis]
Share Repurchase Program [Domain]
Share Repurchase Program [Domain]
Thereafter
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Charge on cash flow hedge
Amortization of Deferred Hedge Gains
Equity Component [Domain]
Equity Component [Domain]
Fair value, nonrecurring
Fair Value, Nonrecurring [Member]
Subsequent event type [Domain]
Subsequent Event Type [Domain]
Senior Secured Term Loan
Secured Debt [Member]
Total assets
Assets, Fair Value Disclosure
Senior Secured Term Loan
Term Loan Facility [Member]
Term Loan Facility
Operating leases
Lessee, Operating Leases [Text Block]
Number of interest rate derivatives held
Number of Interest Rate Derivatives Held
Lessee, Lease, Description [Line Items]
Lessee, Lease, Description [Line Items]
Hedging Designation [Domain]
Hedging Designation [Domain]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Number of operating segments
Number of Operating Segments
Less current portion of long-term debt and debt issuance costs
Long-term Debt, Current Maturities, Gross
Long-term Debt, Current Maturities, Gross
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Level 1
Fair Value, Inputs, Level 1 [Member]
Weighted average contractual term of options outstanding
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Award Type [Axis]
Award Type [Axis]
Senior Secured Notes
Senior Secured Notes [Member]
Senior Secured Notes
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Operating lease liabilities
Operating Lease, Liability, Current
Restructuring
Restructuring charges
Restructuring Costs
Derivative instruments
Derivative assets
Derivative Asset
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net
Total long-term debt, net
Long-Term Debt, Excluding Current Maturities
Total Liabilities
Liabilities
Weighted average remaining lease term
Operating Lease, Weighted Average Remaining Lease Term
Geographical [Axis]
Geographical [Axis]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, before tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax
Prior period acquisitions
Goodwill, Purchase Accounting Adjustments
Percentage of share capital acquired
Business Acquisition, Percentage of Voting Interests Acquired
Technology assets
Technology-Based Intangible Assets [Member]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Senior Secured Revolving Loan Facility
Revolving Credit Facility [Member]
Revenue recognition
Revenue from Contract with Customer [Policy Text Block]
Available for sale investments
Available for sale securities (short-term)
Debt Securities, Available-for-Sale, Current
Document Type
Document Type
Weighted Average Exercise Price
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
SOFR
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Bank credit lines and loan facilities
Long-Term Debt [Text Block]
Outstanding Number of Shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Canceled/expired (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period
Compensation Related Costs Share Based Payments Disclosure [Table]
Compensation Related Costs Share Based Payments Disclosure [Table]
Compensation Related Costs Share Based Payments Disclosure [Table]
Restructuring Type [Axis]
Restructuring Type [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Outstanding at beginning of period (in USD per share)
Outstanding at end of period (in USD per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Costs and expenses:
Cost of Revenue [Abstract]
Cash flows from operating activities:
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Year 1
Lessee, Operating Lease, Liability, to be Paid, Year One
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax
2026
Long-Term Debt, Maturity, Year Three
Share repurchase costs
Payments For Share Repurchase Costs
Payments For Share Repurchase Costs
Subsequent event
Subsequent Event [Member]
Schedule of accounts receivables and unbilled revenue, and unbilled services and unearned revenue
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Document Period End Date
Document Period End Date
Share issuance costs
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs
Total Assets
Assets
Debt Disclosure [Abstract]
Net income per Ordinary Share attributable to the Group (note 13):
Earnings Per Share [Abstract]
Income Statement Location [Axis]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line
Income Statement Location [Axis]
Assumptions:
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Interest Rate Swap
Interest Rate Swap [Member]
Schedule of Restructuring and Related Costs [Table]
Schedule of Restructuring and Related Costs [Table]
Exercised (in USD per share)
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Year 5
Lessee, Operating Lease, Liability, to be Paid, Year Five
Net cash used in financing activities
Net Cash Provided by (Used in) Financing Activities
Long-term debt at fair value
Long-Term Debt, Fair Value
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Accounts receivable and unbilled revenue, net
Contracts Receivable, Net
Contracts Receivable, Net
Senior Secured Revolving Loan Facility
Line of Credit [Member]
Clients 6-10
Clients 6-10 [Member]
Clients 6-10 [Member]
Shareholders' Equity:
Stockholders' Equity Attributable to Parent [Abstract]
Prepayments and other current assets
Prepaid Expense and Other Assets, Current
Unbilled revenue
Unbilled services (unbilled revenue)
Contract with Customer, Asset, before Allowance for Credit Loss, Current
Deferred taxes
Deferred Income Taxes and Tax Credits
Net income per ordinary share
Earnings Per Share [Text Block]
Other Undenominated Capital
Other Undenominated Capital [Member]
Other undenominated capital.
Customer [Axis]
Customer [Axis]
Non-current other liabilities
Other Noncurrent Liabilities [Member]
Schedule of weighted average fair values and assumptions used
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Interest Rate Caps
Interest Rate Cap [Member]
Schedule of Components of Income Tax Expense
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Award Type [Domain]
Award Type [Domain]
Weighted average contractual term of options exercisable
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Schedule of Finite-Lived Intangible Assets
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Income taxes receivable
Income Taxes Receivable, Current
Derivative Contract [Domain]
Derivative Contract [Domain]
Cash flows from financing activities:
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Entity Registrant Name
Entity Registrant Name
Subsequent Events
Subsequent Events [Text Block]
Non-current bank credit lines and loan facilities
Long-Term Line of Credit, Noncurrent
Dividend yield
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Restructuring Reserve [Roll Forward]
Restructuring Reserve [Roll Forward]
Foreign exchange movement
Goodwill, Foreign Currency Translation Gain (Loss)
Customer relationships
Customer Relationships [Member]
Other net assets
Increase (Decrease) in Other Current Assets and Liabilities, Net
Income before share of earnings from equity method investments
Income (Loss) From Continuing Operations Before Equity Method Investments, Noncontrolling Interest
Income (Loss) From Continuing Operations Before Equity Method Investments, Noncontrolling Interest
Leases [Abstract]
Leases [Abstract]
Minimum
Minimum [Member]
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Ordinary shares, par value (in EUR cents per share)
Common Stock, Par or Stated Value Per Share
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Fair value measurements
Fair Value Disclosures [Text Block]
Clients 1-5
Clients 1-5 [Member]
Clients 2-5 [Member]
Intangible assets
Intangible Assets Disclosure [Text Block]
Investments Measured at Net Asset Value
Fair Value Measured at Net Asset Value Per Share [Member]
Derivative Instruments and Hedging Activities Disclosures [Table]
Derivative Instruments and Hedging Activities Disclosures [Table]
Title of Individual [Axis]
Title of Individual [Axis]
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Restricted Stock Units (RSUs)
Restricted Stock Units (RSUs) [Member]
Drawdown of bank credit lines and loan facilities
Proceeds from Lines of Credit
London Interbank Offered Rate (LIBOR)
London Interbank Offered Rate (LIBOR) [Member]
Net balance
Advance Payments Netted Against Unbilled Contracts Receivable
Advance Payments Netted Against Unbilled Contracts Receivable
Subsequent Events [Abstract]
Share repurchase program, authorized percentage
Stock Repurchase Program, Authorized Percentage
Stock Repurchase Program, Authorized Percentage
Ordinary shares which have been reserved for issuance (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized
Loss on cash flow hedge
Other Comprehensive Income (Loss), Cash Flow Hedge, Adjustment, Amortization, After Tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Adjustment, Amortization, After Tax
Income taxes
Income Tax Disclosure [Text Block]
Credit Facility [Domain]
Credit Facility [Domain]
Interest paid
Interest Paid, Excluding Capitalized Interest, Operating Activities
Schedule of Goodwill
Schedule of Goodwill [Table Text Block]
Basic (in USD per share)
Earnings Per Share, Basic
Year 3
Lessee, Operating Lease, Liability, to be Paid, Year Three
Fair value of stock units vested
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Total long-term debt
Long-term Debt, Excluding Current Maturities, Gross
Long-term Debt, Excluding Current Maturities, Gross
Total Shareholders' Equity
Beginning balance
Ending balance
Stockholders' Equity Attributable to Parent
Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Restricted stock units 2013
Restricted Stock Units Twenty Thirteen [Member]
Restricted Stock Units Twenty Thirteen [Member]
Forfeited (in USD per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Ireland
IRELAND
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Changes in operating assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Comprehensive income:
Net Income (Loss) Attributable to Parent [Abstract]
Sale of available for sale investments
Proceeds from Sale of Debt Securities, Available-for-Sale
Retained Earnings
Retained Earnings [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Net operating lease costs
Total lease cost
Lease, Cost
Ordinary shares
Common Stock [Member]
Other comprehensive (loss), net of tax
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Issue of restricted share units / performance share units
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture
Schedule of Lease Costs
Lease, Cost [Table Text Block]
Repurchase of ordinary shares
Payments for Repurchase of Common Stock
Stock units to be granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant
Income taxes
Income Tax, Policy [Policy Text Block]
Statement [Table]
Statement [Table]
Shares vested (in USD per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Current assets:
Assets, Current [Abstract]
Variable rate component two
Variable Rate Component Two [Member]
Variable Rate Component Two
Lease liabilities
Operating Lease, Liability, Noncurrent
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Sale of investments in equity - long term
Proceeds from Sale of Long-Term Investments
Other receivables
Nontrade Receivables, Current
Schedule of Distribution of Revenue by Geographical Area
Revenue from External Customers by Geographic Areas [Table Text Block]
Retained earnings
Retained Earnings (Accumulated Deficit)
Derivative, variable interest rate, reference rate in excess of
Derivative, Variable Interest Rate, Reference Rate In Excess Of
Derivative, Variable Interest Rate, Reference Rate In Excess Of
Other undenominated capital
Other Undenominated Capital
Other undenominated capital.
Accounts receivable, net of allowance for credit losses
Accounts Receivable, after Allowance for Credit Loss, Current
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Equity Components [Axis]
Equity Components [Axis]
Exercisable at end of period (in USD per share)
Weighted average exercise price of options exercisble (USD per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Document Fiscal Year Focus
Document Fiscal Year Focus
Non-executive directors
Non-Executive Director [Member]
Non-executive Director [Member]
Direct costs (excluding depreciation and amortization)
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization
Statement [Line Items]
Statement [Line Items]
Other liability
Other Liability [Member]
Other Liability
Outstanding at beginning of period (in shares)
Outstanding at end of period (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Total cost
Finite-Lived Intangible Assets, Gross
Selling, general and administrative expense
Selling, General and Administrative Expense
Goodwill
Goodwill Disclosure [Text Block]
Operating right-of-use assets
Operating Lease, Right-of-Use Asset
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Member]
Net income per Ordinary Share attributable to the Group:
Earnings Per Share, Basic and Diluted EPS [Abstract]
Earnings Per Share, Basic and Diluted EPS
Foreign exchange movements
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax
Type of Restructuring [Domain]
Type of Restructuring [Domain]
Summary of stock option activity
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
Income from operations
Income from operations
Operating Income (Loss)
Ordinary shares, shares outstanding (in shares)
Common Stock, Shares, Outstanding
Goodwill
Opening balance
Closing balance
Goodwill
Other liabilities
Other Current Liabilities [Member]
Total Liabilities
Liabilities, Fair Value Disclosure
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Provision for income taxes
Provision for income taxes
Income Tax Expense (Benefit)
Geographical [Domain]
Geographical [Domain]
Deferred tax liability
Deferred Income Tax Liabilities, Net
Year 4
Lessee, Operating Lease, Liability, to be Paid, Year Four
Income Statement [Abstract]
Income Statement [Abstract]
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross
Impairment of long lived assets
Impairment, Long-Lived Asset, Held-for-Use
Additional Paid-in Capital
Additional Paid-in Capital [Member]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Document Fiscal Period Focus
Document Fiscal Period Focus
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Oncacare
Oncacare [Member]
Oncacare
Diluted (in shares)
Weighted average number of ordinary shares outstanding for diluted net income per ordinary share (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Derivative instruments
Derivative liability
Derivative Liability
Intangible Assets
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]
Interest rate cap and interest rate swap
Interest Rate Cap And Interest Rate Swap [Member]
Interest Rate Cap And Interest Rate Swap
Billed services (accounts receivable)
Billed Contracts Receivable
Expected life
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term
Clients 11-25
Clients 11-25 [Member]
Clients 11-25 [Member]
Base rate
Base Rate [Member]
Accounts receivable and unbilled revenue, gross
Contracts Receivable, Gross
Contracts Receivable
Ordinary shares, par value 6 euro cents per share; 100,000,000 shares authorized, 81,928,422 shares issued and outstanding at March 31, 2023 and 81,723,555 shares issued and outstanding at December 31, 2022
Common Stock, Value, Issued
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Granted (in USD per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents
Currency translation adjustment
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Accumulated impairment loss
Goodwill, Impaired, Accumulated Impairment Loss
Current Liabilities:
Liabilities, Current [Abstract]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Proceeds from exercise of equity compensation
Proceeds from Stock Options Exercised
Ordinary shares, shares issued (in shares)
Beginning balance (in shares)
Ending balance (in shares)
Common Stock, Shares, Issued
Equity method investments
Equity Method Investments
Unearned revenue
Unearned revenue (payments on account)
Contract with Customer, Liability, Current
Income Statement Location [Domain]
Income Statement Location [Domain]
Transaction and integration-related expenses
Business Combination, Acquisition Related Costs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amendment Flag
Amendment Flag
Estimated Useful Life
Finite-Lived Intangible Asset, Useful Life
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Operating lease costs
Operating Lease, Cost
Debt instrument, principal amount
Debt Instrument, Face Amount
Senior Secured Revolving Loan Facility
Senior Secured Revolving Loan Facility [Member]
Senior Secured Revolving Loan Facility
Total comprehensive income attributable to the group
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Fair Value, Liabilities Measured on Recurring Basis
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Abstract]
Other liabilities
Other Liabilities, Current
Other receivables
Other Assets, Noncurrent
Utilization
Payments for Restructuring
Exercisable at end of period (in shares)
Number of shares exercisable (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number
Depreciation and amortization expense
Depreciation, Depletion and Amortization
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Income before provision for income taxes
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax
Outstanding at beginning of period (in shares)
Outstanding at end of period (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number
Less long-term portion of debt issuance costs and debt discount
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Contract Assets [Abstract]
Contract Assets [Abstract]
Contract Assets
Effect of exchange rate movements on cash
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations
Property, plant and equipment, net
Property, Plant and Equipment, Net
Variable rate component one
Variable Rate Component One [Member]
Variable Rate Component One
Employee Stock Option
Share-Based Payment Arrangement, Option [Member]
Title of Individual [Domain]
Title of Individual [Domain]
Expected volatility
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Patient database
Database Rights [Member]
Exercise of share options
Stock Issued During Period, Value, Stock Options Exercised
Forfeited (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Restructuring
Restructuring and Related Activities Disclosure [Text Block]
Ordinary shares, shares authorized (in shares)
Common Stock, Shares Authorized
Statement of Comprehensive Income [Abstract]
Income taxes payable
Accrued Income Taxes, Current
Non-current assets:
Assets, Noncurrent [Abstract]
Maximum
Maximum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Share repurchase program
Share repurchase program, value of shares repurchased
Stock Repurchased and Retired During Period, Value
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Unearned revenue
Increase (Decrease) in Contract with Customer, Liability
Total current assets
Assets, Current
Total derivatives designated as hedging instruments
Designated as Hedging Instrument [Member]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Measurement Frequency [Domain]
Measurement Frequency [Domain]
Share capital
Stockholders' Equity Note Disclosure [Text Block]
Reduction in carrying value of operating right-of-use assets
Operating Lease, Right-of-Use Asset, Amortization Expense
Intangible assets
Net book value
Finite-Lived Intangible Assets, Net
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Fair Value, Assets Measured on Recurring Basis
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Purchase of available for sale investments
Payments to Acquire Debt Securities, Available-for-Sale
Summary of significant accounting policies
Significant Accounting Policies [Text Block]
Notional
Derivative Asset, Notional Amount
Options Outstanding Number of Shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Investments in equity- long term
Other Long-Term Investments
Income from sub-leases
Sublease Income
Share repurchase program (in shares)
Share repurchase program, number of shares repurchased (in shares)
Stock Repurchased and Retired During Period, Shares
Accounts receivable
Increase (Decrease) in Accounts Receivable
Basis of presentation
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Total costs and expenses
Costs and Expenses
Class of Treasury Stock [Table]
Class of Treasury Stock [Table]
Repayment of bank credit lines and loan facilities
Repayments of Lines of Credit
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Issue of restricted share units / performance share units (in shares)
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture
Total
Operating Lease, Liability
Business Segment and Geographical Information
Segment Reporting Disclosure [Text Block]
Selling, general and administration costs
Selling, general and administrative
Selling, General and Administrative Expenses [Member]
Consultants Restricted Stock Units 2019
Consultants Restricted Stock Units Twenty Nineteen [Member]
Consultants Restricted Stock Units Twenty Nineteen [Member]
LIABILITIES AND SHAREHOLDERS’ EQUITY
Liabilities and Equity [Abstract]
Granted (in USD per share)
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Canceled/expired (in USD per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price
Performance Share Unit (PSUs)
Performance Share Unit [Member]
Performance Share Unit [Member]
2023 (remaining)
Long-Term Debt, Maturity, Remainder of Fiscal Year
Weighted average number of Ordinary Shares outstanding (note 13):
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Accounts payable
Accounts Payable, Current
Additional provisions
Restructuring Charges
Debt discount paid
Debt Instrument, Unamortized Discount
Hedging Designation [Axis]
Hedging Designation [Axis]
Basic (in shares)
Weighted average number of ordinary shares outstanding for basic net income per ordinary share (in shares)
Weighted Average Number of Shares Outstanding, Basic
U.S.
UNITED STATES
Schedule of non-cash stock compensation expense
Schedule of Non Cash Stock Compensation Expense [Table Text Block]
Schedule of Non Cash Stock Compensation Expense.
Commitments and contingencies
Commitments and Contingencies
Outstanding at beginning of period (in USD per share)
Outstanding at end of period (in USD per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Derivative, notional amount
Derivative, Notional Amount
Other
Other Customers [Member]
Other Customers [Member]
Schedule of Outstanding Debt
Schedule of Debt [Table Text Block]
Revenue
Revenue from Contract with Customer, Excluding Assessed Tax
Rest of Europe
Rest Of Europe [Member]
Rest Of Europe [Member]
Goodwill at fair value
Goodwill, Fair Value Disclosure
Senior secured credit facility and senior secured notes
Senior Secured Credit Facility And Senior Secured Notes [Member]
Senior Secured Credit Facility And Senior Secured Notes
Non-current liabilities:
Liabilities, Noncurrent [Abstract]
Cover [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]
Level 3
Fair Value, Inputs, Level 3 [Member]
Available for sale investments (long-term)
Debt Securities, Available-for-Sale, Noncurrent
Sale of investments in equity - long term
Payments to Acquire Long-Term Investments
Depreciation and amortization
Depreciation, Depletion and Amortization, Nonproduction
Share-based awards
Share-Based Payment Arrangement [Text Block]
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities [Abstract]
Allowance for credit losses
Accounts Receivable, Allowance for Credit Loss
Order backlog
Order or Production Backlog [Member]
Revenue
Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities)
Revenue from Contract with Customer [Text Block]
Segment Reporting [Abstract]
Segment Reporting [Abstract]
Unbilled revenue
Increase (Decrease) in Contract with Customer, Asset
Risk-free interest rate
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Total Liabilities and Shareholders' Equity
Liabilities and Equity
Amortization of financing costs and debt discount
Amortization of Debt Issuance Costs
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Goodwill [Roll Forward]
Goodwill [Roll Forward]
Rest of World
Rest of World [Member]
Rest of World [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Level 2
Fair Value, Inputs, Level 2 [Member]
Current Fiscal Year End Date
Current Fiscal Year End Date
Interest and related penalties
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Lease imputed interest
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Diluted (in USD per share)
Earnings Per Share, Diluted
Shares vesting period
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period
Share issue costs
Payments of Stock Issuance Costs
Non-cash stock compensation expense
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
2027 and thereafter
Long-Term Debt, Maturity, Year Four And Thereafter
Long-Term Debt, Maturity, Year Four And Thereafter
Net intangible assets at fair value
Finite-Lived Intangible Assets, Fair Value Disclosure
Total current liabilities
Liabilities, Current
Year 2
Lessee, Operating Lease, Liability, to be Paid, Year Two
Non-current income taxes payable
Accrued Income Taxes, Noncurrent
Liability for unrecognized tax benefit
Unrecognized Tax Benefits
Facility liability
Facility Liability [Member]
Facility Liability
Restructuring Cost and Reserve [Line Items]
Restructuring Cost and Reserve [Line Items]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share Repurchase Program
Share Repurchase Program [Axis]
Revenue, remaining performance obligation
Revenue, Remaining Performance Obligation, Amount
Equity, Class of Treasury Stock [Line Items]
Equity, Class of Treasury Stock [Line Items]
Schedule of Operating Lease Maturity
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Buyback Program
Buyback Program [Member]
Buyback Program [Member]
Fair Value Disclosures [Abstract]
Interest expense
Interest Expense
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Trade names & brands
Trade Names [Member]
Credit Facility [Axis]
Credit Facility [Axis]
Equity [Abstract]
Equity [Abstract]
Shares vested (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Weighted Average Remaining Contractual Life
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]
Ordinary shares which have been reserved for issuance (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Schedule of Distribution of Depreciation and Amortization by Geographical Area
Long-Lived Assets by Geographic Areas [Table Text Block]
Derivative, fixed interest rate
Derivative, Fixed Interest Rate
Schedule of Disaggregation of Revenue
Disaggregation of Revenue [Table Text Block]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Abstract]
Net decrease in cash and cash equivalents
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Summary of details of movement in restructuring charges
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Effect of dilutive share options and other awards outstanding under share based compensation programs (in shares)
Weighted Average Number of Shares Outstanding, Diluted, Adjustment
Summary of Restructuring Charges
Restructuring and Related Costs [Table Text Block]
Entity Central Index Key
Entity Central Index Key
Interest income
Investment Income, Interest
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Weighted Average Grant Date Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Variable Rate Component [Domain]
Variable Rate Component [Domain]
Variable Rate Component [Domain]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Business Combination, Consideration Transferred
Business Combination, Consideration Transferred
Percentage change in unearned revenue (payments on account)
Increase (Decrease) In Contract With Customer, Liability, Gross, Current, Percent
Increase (Decrease) In Contract with Customer, Liability, Gross, Current, Percent
ASSETS
Assets [Abstract]
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Current bank credit lines and loan facilities
Line of Credit, Current
Revenue, remaining performance obligation percentage
Revenue, Remaining Performance Obligation, Percentage
2024
Long-Term Debt, Maturity, Year One
Stock compensation expense
Share-Based Payment Arrangement, Noncash Expense
Weighted average grant date fair value
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Repayments of senior debt
Repayments of Senior Debt
Variable Rate [Axis]
Variable Rate [Axis]
Non-current other liabilities
Other Liabilities, Noncurrent
Share of losses in equity method investments
Loss on equity method investments
Income (Loss) from Equity Method Investments
Purchase of property, plant and equipment
Payments to Acquire Property, Plant, and Equipment
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Change in unbilled services (unbilled revenue)
Increase in unbilled services (unbilled revenue)
Increase (Decrease) In Contract With Customer, Asset, Gross, Current
Increase (Decrease) In Contract With Customer, Asset, Gross, Current
Schedule of reconciliation of number of shares used in computation of basic and diluted net income per ordinary share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Line of credit facility, interest rate at period end
Line of Credit Facility, Interest Rate at Period End
Right-of-use assets obtained in exchange for lease obligations
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Direct costs
Cost of Sales [Member]
Customer [Domain]
Customer [Domain]
Other Liabilities