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Employee Share-Based Incentive Compensation Plans (OneBeason - Peformance Shares) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Performance Share
One Beacon Long Term Incentive Plan
Jun. 30, 2012
Performance Share
One Beacon Long Term Incentive Plan
Jun. 30, 2013
Performance Share
One Beacon Long Term Incentive Plan
Jun. 30, 2012
Performance Share
One Beacon Long Term Incentive Plan
Jun. 30, 2012
Performance cycle 2009-2011
Performance Share
One Beacon Long Term Incentive Plan
Jun. 30, 2013
One Beacon Long Term Incentive Plan
Performance Share
Share-based compensation arrangement by share-based payment award                
Vesting Period               3 years
Target Performance Shares Outstanding                
Beginning of period (in shares)     489,867 569,745 563,190 642,667    
Shares paid or expired (in shares)     0 [1] (9,168) [1] (238,658) [1] (258,901) [1]    
New grants (in shares)     0 0 179,000 181,290    
Assumed forfeitures and cancellations     0 [2] 0 [2] (13,665) [2] (4,479) [2]    
Ending of period (in shares)     489,867 560,577 489,867 560,577    
Expense Amortized                
Accrued expense at the beginning of period $ 125.9 $ 159.0 $ 1.6 $ 3.2 $ 1.2 $ 9.7    
Payments and deferrals     0 [1] (0.3) [1] 0 [1] (7.8) [1]    
Assumed forfeitures and cancellations     (0.1) [2] 0 [2] (0.1) [2] 0 [2]    
Expense recognized     0.9 0.2 1.3 1.2    
Accrued expense at the end of the period 125.9 159.0 2.4 3.1 2.4 3.1    
Percentage of target payout - minimum actual             138.60%  
Additional compensation cost that would be recognized if all outstanding performance shares vested     $ 1.1   $ 1.1      
[1] There were no payments made in 2013 for the 2010-2012 performance cycle; those performance shares did not meet the threshold performance goals and expired. OneBeacon performance share payments in 2012 for the 2009-2011 performance cycle were at 138.6% of target. Amounts include deposits into OneBeacon’s deferred compensation plan.
[2] Amounts include changes in assumed forfeitures, as required under GAAP.