0001001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 1001002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 1002003 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1003004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 1004005 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 1005006 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 2101101 - Disclosure - Basis of presentation link:presentationLink link:calculationLink link:definitionLink 2102102 - Disclosure - Significant accounting policies link:presentationLink link:calculationLink link:definitionLink 2203201 - Disclosure - Significant accounting policies (Policies) link:presentationLink link:calculationLink link:definitionLink 2404401 - Disclosure - Significant accounting policies (Details) link:presentationLink link:calculationLink link:definitionLink 2105103 - Disclosure - Revenue link:presentationLink link:calculationLink link:definitionLink 2306301 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 2407402 - Disclosure - Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2108104 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) link:presentationLink link:calculationLink link:definitionLink 2309302 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) (Tables) link:presentationLink link:calculationLink link:definitionLink 2410403 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Contract Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2411404 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2411404 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2112105 - Disclosure - Goodwill link:presentationLink link:calculationLink link:definitionLink 2313303 - Disclosure - Goodwill (Tables) link:presentationLink link:calculationLink link:definitionLink 2414405 - Disclosure - Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 2115106 - Disclosure - Business combinations link:presentationLink link:calculationLink link:definitionLink 2316304 - Disclosure - Business combinations (Tables) link:presentationLink link:calculationLink link:definitionLink 2417406 - Disclosure - Business combinations - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2418407 - Disclosure - Business combinations - Schedule of Acquisitions (Details) link:presentationLink link:calculationLink link:definitionLink 2119107 - Disclosure - Equity method investments link:presentationLink link:calculationLink link:definitionLink 2320305 - Disclosure - Equity method investments (Tables) link:presentationLink link:calculationLink link:definitionLink 2421408 - Disclosure - Equity method investments (Details) link:presentationLink link:calculationLink link:definitionLink 2122108 - Disclosure - Restructuring link:presentationLink link:calculationLink link:definitionLink 2323306 - Disclosure - Restructuring (Tables) link:presentationLink link:calculationLink link:definitionLink 2424409 - Disclosure - Restructuring - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2425410 - Disclosure - Restructuring - Rollforward Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2426411 - Disclosure - Restructuring charges - Future Minimum Lease Payments (Details) link:presentationLink link:calculationLink link:definitionLink 2127109 - Disclosure - Operating leases link:presentationLink link:calculationLink link:definitionLink 2328307 - Disclosure - Operating leases (Tables) link:presentationLink link:calculationLink link:definitionLink 2429412 - Disclosure - Operating leases - Lease Costs (Details) link:presentationLink link:calculationLink link:definitionLink 2430413 - Disclosure - Operating leases - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2431414 - Disclosure - Operating leases - Operating Lease Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 2431414 - Disclosure - Operating leases - Operating Lease Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 2132110 - Disclosure - Income taxes link:presentationLink link:calculationLink link:definitionLink 2333308 - Disclosure - Income taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 2434415 - Disclosure - Income taxes - Income Taxes Recognized During Period (Details) link:presentationLink link:calculationLink link:definitionLink 2435416 - Disclosure - Income taxes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2136111 - Disclosure - Net income per ordinary share link:presentationLink link:calculationLink link:definitionLink 2337309 - Disclosure - Net income per ordinary share (Tables) link:presentationLink link:calculationLink link:definitionLink 2438417 - Disclosure - Net income per ordinary share - Reconciliation of Number of Shares Used in Computation of Basic and Diluted Net Income Per Ordinary Share (Details) link:presentationLink link:calculationLink link:definitionLink 2439418 - Disclosure - Net income per ordinary share - Reconciliation of Net Income Attributable to the Group and Net Income Attributable To the Group (Including NCI Redemption Amount) (Details) link:presentationLink link:calculationLink link:definitionLink 2140112 - Disclosure - Share-based awards link:presentationLink link:calculationLink link:definitionLink 2341310 - Disclosure - Share-based awards (Tables) link:presentationLink link:calculationLink link:definitionLink 2442419 - Disclosure - Share-based awards - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2443420 - Disclosure - Share-based awards - Summary of Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2444421 - Disclosure - Share-based awards - Summary of Movement in Non-Vested Share Options (Details) link:presentationLink link:calculationLink link:definitionLink 2445422 - Disclosure - Share-based awards - Schedule of Weighted Average Fair Values and Assumptions Used (Details) link:presentationLink link:calculationLink link:definitionLink 2446423 - Disclosure - Share-based awards - Summary of RSU and PSU Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2447424 - Disclosure - Share-based awards - Schedule of Non-cash Stock Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2148113 - Disclosure - Share capital link:presentationLink link:calculationLink link:definitionLink 2449425 - Disclosure - Share capital (Details) link:presentationLink link:calculationLink link:definitionLink 2150114 - Disclosure - Business segment information link:presentationLink link:calculationLink link:definitionLink 2351311 - Disclosure - Business segment information (Tables) link:presentationLink link:calculationLink link:definitionLink 2452426 - Disclosure - Business segment information - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2453427 - Disclosure - Business segment information - Distribution of Revenue by Geographical Area (Details) link:presentationLink link:calculationLink link:definitionLink 2454428 - Disclosure - Business segment information - Distribution of Income from Operations, Including Restructuring, by Geographical Area (Details) link:presentationLink link:calculationLink link:definitionLink 2455429 - Disclosure - Business segment information - Distribution of Income from Operations, Excluding Restructuring by Geographical Area (Details) link:presentationLink link:calculationLink link:definitionLink 2456430 - Disclosure - Business segment information - Distribution of Long-lived Assets, Net, by Geographical Area (Details) link:presentationLink link:calculationLink link:definitionLink 2457431 - Disclosure - Business segment information - Distribution of Depreciation and Amortization by Geographical Area (Details) link:presentationLink link:calculationLink link:definitionLink 2458432 - Disclosure - Business segment information - Distribution of Total Assets by Geographical Area (Details) link:presentationLink link:calculationLink link:definitionLink 2159115 - Disclosure - Impact of change in accounting policies link:presentationLink link:calculationLink link:definitionLink