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Employee Share-Based Incentive Compensation Plans (OneBeacon - Restricted Shares) (Details) (OneBeacon, One Beacon Long Term Incentive Plan, USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Mar. 01, 2012
Restricted Stock
Mar. 31, 2014
Restricted Stock
Mar. 31, 2013
Restricted Stock
Feb. 28, 2012
Restricted Stock
Installment
May 31, 2011
Restricted Stock
Chief Executive Officer
May 25, 2011
Restricted Stock
Chief Executive Officer
Installment
Mar. 31, 2014
Performance Share
Mar. 31, 2013
Performance Share
May 31, 2011
Performance Share
Chief Executive Officer
May 31, 2011
Performance Cycle 2011 to 2013
Performance Share
Chief Executive Officer
Target Restricted Share Activity                    
Beginning of period (in shares)   915,000 927,000       493,421 563,190    
Issued (in shares) 300,000 0 0   630,000          
Vested (in shares)   300,000 9,000              
Assumed forfeitures and cancellations   (2,500) 0       (4,145) (13,665)    
Ending of period (in shares)   612,500 918,000       512,938 489,867    
Unamortized grant date fair value                    
Unamortized grant date fair value, beginning balance   $ 6.5 $ 9.6              
Issued   0 0              
Assumed forfeitures and cancellations   0 0       0 0    
Expense recognized   (0.8) (0.8)       (0.6) (0.4)    
Unamortized grant date fair value, ending balance   $ 5.7 $ 8.8       $ 4.7      
Number of Installments in which the Shares Vest       2   4        
Annual reduction in performance shares                   35,000
Years Performance Shares will be Forfeited                 5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Reduction in the next five years         35,000