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Disclosure - Reserves for unpaid losses and loss adjustment expenses - Asbestos and Environmental Loss and Loss Adjustment Expense Reserve Activity (Details) link:presentationLink link:calculationLink link:definitionLink 40504 - Disclosure - Reserves for unpaid losses and loss adjustment expenses - Reconciliation of liabilities for unpaid loss and LAE (Details) link:presentationLink link:calculationLink link:definitionLink 40801 - Disclosure - Investment securities - Net Investment Income (Details) link:presentationLink link:calculationLink link:definitionLink 40802 - Disclosure - Investment securities - Net Realized and Unrealized Investment (Losses) Gains (Details) link:presentationLink link:calculationLink link:definitionLink 40803 - Disclosure - Investment securities - Fixed maturity investments (Details) link:presentationLink link:calculationLink link:definitionLink 40901 - Disclosure - Fair value measurements - Fair Value Measurements by Level (Details) link:presentationLink link:calculationLink link:definitionLink 41003 - Disclosure - Goodwill and intangible assets - Estimation of remaining amortization expense (Details) link:presentationLink link:calculationLink link:definitionLink 41101 - Disclosure - Debt and standby letters of credit facilities (Details) link:presentationLink link:calculationLink link:definitionLink 41102 - Disclosure - Debt and standby letters of credit facilities - Schedule of contractual repayments (Details) link:presentationLink link:calculationLink link:definitionLink 41202 - Disclosure - Income taxes - Total income tax (expense) benefit (Details) link:presentationLink link:calculationLink link:definitionLink 41203 - Disclosure - Income taxes - Effective Rate Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 41205 - Disclosure - Income taxes - Deferred Tax Inventory (Details) link:presentationLink link:calculationLink link:definitionLink 41206 - Disclosure - Income taxes - Net Operating Loss and Capital Loss Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 41406 - Disclosure - Employee benefit plans and compensation plans - Defined benefit plans - Expense (Details) link:presentationLink link:calculationLink link:definitionLink 41407 - Disclosure - Employee benefit plans and compensation plans - Defined benefit plans - Payments (Details) link:presentationLink link:calculationLink link:definitionLink 41601 - Disclosure - Earnings per share (Details) link:presentationLink link:calculationLink link:definitionLink 42204 - Disclosure - Commitments and contingencies - Leases (Details) link:presentationLink link:calculationLink link:definitionLink 42601 - Disclosure - Schedule II - Condensed Financial Information of Registrant - Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 42604 - Disclosure - Schedule II - Condensed Financial Information of Registrant - Statements of Cash Flows (Details) link:presentationLink link:calculationLink link:definitionLink 00090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 00105 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00400 - Statement - Consolidated Statements of Shareholder's Equity link:presentationLink link:calculationLink link:definitionLink 30303 - Disclosure - Significant transactions (Tables) link:presentationLink link:calculationLink link:definitionLink 30503 - Disclosure - Reserves for unpaid losses and loss adjustment expenses (Tables) link:presentationLink link:calculationLink link:definitionLink 30803 - Disclosure - Investment securities (Tables) link:presentationLink link:calculationLink link:definitionLink 31403 - Disclosure - Employee benefit plans and compensation plans (Tables) link:presentationLink link:calculationLink link:definitionLink 31903 - Disclosure - Investments in unconsolidated entities (Tables) link:presentationLink link:calculationLink link:definitionLink 40201 - Disclosure - Summary of significant accounting policies - Deferred software costs (Details) link:presentationLink link:calculationLink link:definitionLink 40202 - Disclosure - Summary of significant accounting policies - Share-based compensation (Details) link:presentationLink link:calculationLink link:definitionLink 40204 - Disclosure - Summary of significant accounting policies - Foreign currency exchange (Details) link:presentationLink link:calculationLink link:definitionLink 40205 - Disclosure - Summary of significant accounting policies - Recent adopted changes in accouting principle and Recent accounting pronouncements (Details) link:presentationLink link:calculationLink link:definitionLink 40301 - Disclosure - Significant transactions - Easterly Acquisition Corp., WRM America Indemnity Company, Inc. and The Phoenix Holdings Ltd. (Details) link:presentationLink link:calculationLink link:definitionLink 40303 - Disclosure - Significant transactions - IMG Acquisition - Series A Redeemable Preference Shares (Details) link:presentationLink link:calculationLink link:definitionLink 40304 - Disclosure - Significant transactions - IMG Acquisition - Supplemental Pro Forma Information (Details) link:presentationLink link:calculationLink link:definitionLink 40305 - Disclosure - Significant transactions - Armada Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 40306 - Disclosure - Significant transactions - Armada Acquisition - Supplemental Pro Forma Information (Details) link:presentationLink link:calculationLink link:definitionLink 40307 - Disclosure - Significant transactions - Mount Beacon, OneBeacon, Ashmere and Symetra (Details) link:presentationLink link:calculationLink link:definitionLink 40402 - Disclosure - Segment information - Net premiums written by client location and underwriting location by reportable segment (Details) link:presentationLink link:calculationLink link:definitionLink 40502 - Disclosure - Reserves for unpaid losses and loss adjustment expenses - By segment (Details) link:presentationLink link:calculationLink link:definitionLink 40505 - Disclosure - Reserves for unpaid losses and loss adjustment expenses - Claim Development (Details) link:presentationLink link:calculationLink link:definitionLink 40506 - Disclosure - Reserves for unpaid losses and loss adjustment expenses - Average Annual Percentage Payout of Incurred Losses and Allocated LAE by Age, Net of Reinsurance (Details) link:presentationLink link:calculationLink link:definitionLink 40601 - Disclosure - Third party reinsurance - The effects of reinsurance (Details) link:presentationLink link:calculationLink link:definitionLink 40602 - Disclosure - Third party reinsurance- Industry loss warranty contracts (Details) link:presentationLink link:calculationLink link:definitionLink 40603 - Disclosure - Third party reinsurance- CMIG International acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 40604 - Disclosure - Third party reinsurance- Gross and net recoverable amounts (Details) link:presentationLink link:calculationLink link:definitionLink 40605 - Disclosure - Third party reinsurance - Highest gross recoverable amounts by reinsurer (Details) link:presentationLink link:calculationLink link:definitionLink 40701 - Disclosure - Deferred acquisition costs (Details) link:presentationLink link:calculationLink link:definitionLink 40804 - Disclosure - Investment securities - Mortgage-backed, Asset-backed Securities (Details) link:presentationLink link:calculationLink link:definitionLink 40805 - Disclosure - Investment securities - Equity securities and Other long-term investments (Details) link:presentationLink link:calculationLink link:definitionLink 40806 - Disclosure - Investment securities - Hedge Funds and Private Equity Funds (Details) link:presentationLink link:calculationLink link:definitionLink 40807 - Disclosure - Investment securities - Hedge Funds redemption frequency and Private Equity Fund lock-up period (Details) link:presentationLink link:calculationLink link:definitionLink 40808 - Disclosure - Investment securities - Investments Held on Deposit or as Collateral and Unsettled investment purchases and sales (Details) link:presentationLink link:calculationLink link:definitionLink 40902 - Disclosure - Fair value measurements - Rollforward of Level 3 Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 40903 - Disclosure - Fair value measurements - Transfers between levels (Details) link:presentationLink link:calculationLink link:definitionLink 40904 - Disclosure - Fair value measurements - Significant Unobservable Inputs (Details) link:presentationLink link:calculationLink link:definitionLink 40905 - Disclosure - Fair value measurements - Financial instruments disclosed, but not carried at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 40906 - Disclosure - Fair value measurements - Fair Value Measurements on a Non-Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 41002 - Disclosure - Goodwill and intangible assets - Components of goodwill and intangible assets (Details) link:presentationLink link:calculationLink link:definitionLink 41103 - Disclosure - Debt and standby letters of credit facilities - 2017 SEK Subordinated Notes and 2016 SIG Senior Notes (Details) link:presentationLink link:calculationLink link:definitionLink 41104 - Disclosure - Debt and standby letters of credit facilities - 2007 SIG Senior Notes and Old Lyme Note (Details) link:presentationLink link:calculationLink link:definitionLink 41105 - Disclosure - Debt and standby letters of credit facilities - Standby Letter of Credit Facilities (Details) link:presentationLink link:calculationLink link:definitionLink 41106 - Disclosure - Debt and standby letters of credit facilities - Revolving Credit Facility (Details) link:presentationLink link:calculationLink link:definitionLink 41107 - Disclosure - Debt and standby letters of credit facilities - Interest (Details) link:presentationLink link:calculationLink link:definitionLink 41201 - Disclosure - Income taxes - Net income (loss) before income taxes (Details) link:presentationLink link:calculationLink link:definitionLink 41204 - Disclosure - Income taxes - Tax Cuts and Jobs Act and Tax Payments and Receipts (Details) link:presentationLink link:calculationLink link:definitionLink 41207 - Disclosure - Income taxes - Uncertain Tax Positions (Details) link:presentationLink link:calculationLink link:definitionLink 41301 - Disclosure - Derivatives - Interest Rate Cap (Details) link:presentationLink link:calculationLink link:definitionLink 41302 - Disclosure - Derivatives - Classification and Fair Value of Derivatives in Consolidated Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 41303 - Disclosure - Derivatives - Classification and Fair Value of Derivatives in Consolidated of (Loss) Income Statements (Details) link:presentationLink link:calculationLink link:definitionLink 41401 - Disclosure - Employee benefit plans and compensation plans - Defined benefit plans (Details) link:presentationLink link:calculationLink link:definitionLink 41402 - Disclosure - Employee benefit plans and compensation plans - Defined benefit plans - Plan Assets (Details) link:presentationLink link:calculationLink link:definitionLink 41403 - Disclosure - Employee benefit plans and compensation plans - Defined benefit plans - Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 41404 - Disclosure - Employee benefit plans and compensation plans - Defined benefit plans - Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 41405 - Disclosure - Employee benefit plans and compensation plans - Defined benefit plans - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 41408 - Disclosure - Employee benefit plans and compensation plans - Defined contribution plans - Non U.S (Details) link:presentationLink link:calculationLink link:definitionLink 41409 - Disclosure - Employee benefit plans and compensation plans - Share-Based and Other Long-Term Incentive Compensation Plans (Details) link:presentationLink link:calculationLink link:definitionLink 41501 - Disclosure - Common shareholder's equity, mezzanine equity, and non controlling interests - Common shareholder (Details) link:presentationLink link:calculationLink link:definitionLink 41502 - Disclosure - Common shareholder's equity, mezzanine equity, and non controlling interests - Mezzanine equity (Details) link:presentationLink link:calculationLink link:definitionLink 41503 - Disclosure - Common shareholder's equity, mezzanine equity, and non controlling interests - Non-controlling interests (Details) link:presentationLink link:calculationLink link:definitionLink 41701 - Disclosure - Accumulated other comprehensive (loss) (Details) link:presentationLink link:calculationLink link:definitionLink 41801 - Disclosure - Statutory capital and surplus (Details) link:presentationLink link:calculationLink link:definitionLink 41802 - Disclosure - Statutory capital and surplus - Dividend Capacity, Capital Maintenance and Safety Reserve (Details) link:presentationLink link:calculationLink link:definitionLink 41901 - Disclosure - Investments in unconsolidated entities - Other long-term investments (Details) link:presentationLink link:calculationLink link:definitionLink 41902 - Disclosure - Investments in unconsolidated entities - Equity method unconsolidated entities (Details) link:presentationLink link:calculationLink link:definitionLink 41903 - Disclosure - Investments in unconsolidated entities - Summarized Financial Information (Details) link:presentationLink link:calculationLink link:definitionLink 41904 - Disclosure - Investments in unconsolidated entities - Equity Method Eligible Affiliates, OneBeacon (Details) link:presentationLink link:calculationLink link:definitionLink 42001 - Disclosure - Variable interest entities (Details) link:presentationLink link:calculationLink link:definitionLink 42002 - Disclosure - Variable interest entities - Unconsolidated VIE (Details) link:presentationLink link:calculationLink link:definitionLink 42101 - Disclosure - Transactions with related parties (Details) link:presentationLink link:calculationLink link:definitionLink 42201 - Disclosure - Commitments and contingencies - Gross reinsurance premiums written (Details) link:presentationLink link:calculationLink link:definitionLink 42202 - Disclosure - Commitments and contingencies - Geographic Concentration (Details) link:presentationLink link:calculationLink link:definitionLink 42203 - Disclosure - Commitments and contingencies - Lloyd's Central Fund (Details) link:presentationLink link:calculationLink link:definitionLink 42501 - Disclosure - Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) link:presentationLink link:calculationLink link:definitionLink 42602 - Disclosure - Schedule II - Condensed Financial Information of Registrant - Statements of (Loss) Income (Details) link:presentationLink link:calculationLink link:definitionLink 42603 - Disclosure - Schedule II - Condensed Financial Information of Registrant - Statements of Comprehensive (Loss) Income (Details) link:presentationLink link:calculationLink link:definitionLink 42701 - Disclosure - Schedule III - Supplementary Insurance Information (Details) link:presentationLink link:calculationLink link:definitionLink 42901 - Disclosure - Schedule V - Valuation and Qualifying Accounts (Details) link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - General link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - Summary of significant accounting policies link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - Significant transactions link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - Segment information link:presentationLink link:calculationLink link:definitionLink 10501 - Disclosure - Reserves for unpaid losses and loss adjustment expenses link:presentationLink link:calculationLink link:definitionLink 10601 - 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Disclosure - Schedule I - Summary of Investments - Other Than Investments in Related Parties link:presentationLink link:calculationLink link:definitionLink 12601 - Disclosure - Schedule II - Condensed Financial Information of Registrant link:presentationLink link:calculationLink link:definitionLink 12701 - Disclosure - Schedule III - Supplementary Insurance Information link:presentationLink link:calculationLink link:definitionLink 12801 - Disclosure - Schedule IV - Reinsurance link:presentationLink link:calculationLink link:definitionLink 12903 - Disclosure - Schedule V - Valuation and Qualifying Accounts link:presentationLink link:calculationLink link:definitionLink 13001 - Disclosure - Schedule VI - Insurance Operations link:presentationLink link:calculationLink link:definitionLink 20202 - Disclosure - Summary of significant accounting policies (Policies) link:presentationLink link:calculationLink link:definitionLink 30203 - Disclosure - Summary of significant accounting policies (Tables) link:presentationLink link:calculationLink link:definitionLink 30403 - 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