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Acquisition and Disposals - Sale of Operating Affiliate (Details) (ARX Holding Corporation, USD $)
In Millions, unless otherwise specified
0 Months Ended
Apr. 02, 2015
Mar. 31, 2015
Apr. 01, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Equity method investment, ownership percentage   40.60%us-gaap_EquityMethodInvestmentOwnershipPercentage  
Investment in affiliates   $ 222.6us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue  
Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Consideration received     560us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= xlgroup_ArxHoldingCorporationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Gain on disposal $ 337us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= xlgroup_ArxHoldingCorporationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember