0000001 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONSOLIDATED STATEMENTS OF INCOME (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONSOLIDATED BALANCE SHEETS (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - CONSOLIDATED STATEMENTS OF EQUITY (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Condensed consolidated interim financial statements Condensed consolidated interim financial statements link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Revenue Recognition Revenue Recognition link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Earnings per share (Notes) link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Investments in debt and equity securities link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Goodwill link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Long-term debt link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Shareholders' equity link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Accumulated other comprehensive (loss) income link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Variable interest entities link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Fair value of financial instruments link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Segment reporting link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - New accounting standards link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Condensed consolidated interim financial statements Condensed consolidated interim financial statements (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Revenue Recognition Segment revenue by major payor (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Earnings per share Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Investments in debt and equity securities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Goodwill (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Long-term debt (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Comprehensive Text Block List (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Accumulated other comprehensive (loss) income (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Fair value of financial instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Segment reporting (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Revenue Recognition Segment Revenue by Payor (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Earnings per share Earnings per share - Reconciliation of numerators and denominators used to calculate basic and diluted earnings per share (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Investments in debt and equity securities (Detail) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Goodwill - Changes in Goodwill by Reportable Segments (Detail) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Goodwill - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Long-term debt (Detail) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Long-term debt - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Long-term debt Schedule of Derivative Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Commitments and Contingencies - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Stock-based compensation (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Share repurchases (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Related Party Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Accumulated other comprehensive (loss) income (Detail) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Variable interest entities - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Fair value of financial instruments - Assets and Temporary Equity Measured at Fair Value on Recurring Basis (Detail) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Fair value of financial instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Segment reporting - Summary of Segment Net Revenues, Segment Operating Income (Loss) and Reconciliation of Segment Income to Consolidated Income Before Income Taxes (Detail) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Segment reporting - Summary of Depreciation and Amortization Expense by Segment (Detail) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Segment reporting - Summary of Expenditures for Property and Equipment by Segment (Detail) link:presentationLink link:calculationLink link:definitionLink