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Acquisitions and Disposals - Sale of operating other affiliate (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 02, 2015
May 30, 2014
Dec. 31, 2014
Apr. 01, 2015
ARX Holding Corporation [Member]        
Business Acquisition [Line Items]        
Ownership percentage remaining       40.60%
Investments in affiliates       $ 220.2
Disposal Group, Including Discontinued Operation, Consideration       $ 560.6
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 340.4      
XL Re Life (SAC) Ltd [Member]        
Business Acquisition [Line Items]        
Disposal Group, Including Discontinued Operation, Consideration   $ 570.0    
Sale of Subsidiary Stock, Percentage   100.00%    
Quota Share Reinsurance Percentage   100.00%    
Pro Forma Effect of Sale, After Tax Net Loss     $ 621.3