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Discontinued Operations Discontinued Operations (Surplus Note Table) (Details) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 23, 2014
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax     $ 18.2 $ (1.6) $ 46.6
Surplus Note          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
RBC Score     250.00%    
OneBeacon Runoff          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes $ 101.0        
OneBeacon Runoff | Other long-term investments | Fair Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes $ 64.9        
OneBeacon Runoff | Surplus Note          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
RBC Score 250.00%        
Discontinued Operations          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax         46.6
Discontinued Operations | OneBeacon Runoff          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax     $ 0.3 (18.8) $ 46.6
Discontinued Operations | OneBeacon Runoff | Surplus Note          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
RBC Score     200.00%    
Gain (loss) on sale of discontinued operations, net of tax   $ 36.1      
Interest rate (as a percent)     6.00%    
Gain (loss) on sale of discontinued operations, net of tax $ 36.1        
Par Value [Member] | Discontinued Operations | OneBeacon Runoff | Surplus Note          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes 101.0        
Fair Value [Member] | Discontinued Operations | OneBeacon Runoff | Surplus Note          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes 64.9        
OneBeacon          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (36.1)   $ (49.5) (35.9)  
OneBeacon | Seller Priority Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (14.0)   (19.9)    
OneBeacon | Pari Passu Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (22.1)   (29.6)    
OneBeacon | Par Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes 101.0 101.0 101.0 101.0  
OneBeacon | Par Value [Member] | Seller Priority Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes     57.9    
OneBeacon | Par Value [Member] | Pari Passu Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes 43.1   43.1    
OneBeacon | Par Value [Member] | OneBeacon Runoff | Seller Priority Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes 57.9        
OneBeacon | Current market rates on repayments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (6.8)   (15.1) (6.6)  
OneBeacon | Current market rates on repayments | Seller Priority Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax 1.6   (0.4)    
OneBeacon | Current market rates on repayments | Pari Passu Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (8.4)   (14.7)    
OneBeacon | Regulatory Approval [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (12.6)   (24.2) (12.6)  
OneBeacon | Regulatory Approval [Member] | Seller Priority Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (4.6)   (11.7)    
OneBeacon | Regulatory Approval [Member] | Pari Passu Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (8.0)   (12.5)    
OneBeacon | Liquidity Adjustment [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (16.7)   (10.2) (16.7)  
OneBeacon | Liquidity Adjustment [Member] | Seller Priority Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (11.0)   (7.8)    
OneBeacon | Liquidity Adjustment [Member] | Pari Passu Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (loss) on sale of discontinued operations, net of tax (5.7)   (2.4)    
OneBeacon | Fair Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes 64.9 $ 65.1 51.5 $ 65.1  
OneBeacon | Fair Value [Member] | Seller Priority Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes 43.9   38.0    
OneBeacon | Fair Value [Member] | Pari Passu Surplus Note [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Surplus notes $ 21.0   $ 13.5