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Employee Share-Based Incentive Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Restricted Share Vesting Beginning in February 2014
Mar. 31, 2012
Restricted Share Vesting Beginning in February 2014
Installment
Mar. 31, 2011
Restricted Share Cliff Vesting in January, 2014
Jun. 30, 2012
Restricted Share Cliff Vesting in January, 2014
Jun. 30, 2012
Performance Share [Member]
Performance cycle 2009-2011
Jun. 30, 2012
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share [Member]
Jun. 30, 2011
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share [Member]
Jun. 30, 2012
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share [Member]
Jun. 30, 2011
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share [Member]
Jun. 30, 2012
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share [Member]
Performance cycle 2009-2011
Jun. 30, 2012
OneBeacon Long-Term Incentive Plan
Performance Share [Member]
Jun. 30, 2011
OneBeacon Long-Term Incentive Plan
Performance Share [Member]
Jun. 30, 2012
OneBeacon Long-Term Incentive Plan
Performance Share [Member]
Jun. 30, 2011
OneBeacon Long-Term Incentive Plan
Performance Share [Member]
Jun. 30, 2012
OneBeacon Long-Term Incentive Plan
Performance Share [Member]
Performance cycle 2008-2010
Jun. 30, 2012
OneBeacon Long-Term Incentive Plan
Performance Share [Member]
Performance cycle 2009-2011
Jun. 30, 2012
OneBeacon Long-Term Incentive Plan
Non-Qualified Options
Jun. 30, 2011
OneBeacon Long-Term Incentive Plan
Non-Qualified Options
Jun. 30, 2012
OneBeacon Long-Term Incentive Plan
Non-Qualified Options
Jun. 30, 2011
OneBeacon Long-Term Incentive Plan
Non-Qualified Options
Share-based compensation arrangement by share-based payment award                                            
Issued (in shares)     3,000   27,000 250                                
Number of restricted shares installments       2                                    
Target Performance Share activity                                            
Beginning of period (in shares)               118,450 149,820 150,064 163,184   569,745 718,172 642,667 1,464,295            
Shares paid or expired (in shares)               0 [1] 0 [1] (68,357) [1] (51,131) [1]   (9,168) [2],[3] 0 [2],[3] (258,901) [2],[3] (936,150) [2],[3]            
New grants (in shares)               0 250 35,932 37,675   0 0 181,290 194,900            
Assumed forfeitures and cancellations               0 [4] (6) [4] 811 [4] 336 [4]   0 [5] (46,445) [5] (4,479) [5] (51,318) [5]            
Ending of period (in shares)               118,450 150,064 118,450 150,064   560,577 671,727 560,577 671,727            
Expense Amortized                                            
Accrued expense at the beginning of period $ 113.6 $ 187.9           $ 27.4 $ 35.6 $ 66.1 $ 29.4   $ 3.2 $ 8.4 $ 9.7 $ 18.5     $ 5.0 $ 4.6 $ 5.0 $ 4.5
Payments and deferrals               0 [1] 0 [1] (48.4) [1] 0 [1]   (0.3) [2],[3] 0 [2],[3] (7.8) [2],[3] (10.5) [2],[3]            
Employee Service Share-based Compensation Nonvested Awards Forfeited in Period Total Compensation Cost Not yet Recognized               (0.2) [4] (0.5) [4] 0.8 [4] (0.6) [4]   0 [5] (0.3) [5] 0 [5] (0.3) [5]            
Expense (income) recognized               5.5 21.4 14.2 27.7   0.2 1.9 1.2 2.3     0 0.2 0 0.3
Accrued expense at the end of the period 113.6 187.9           32.7 56.5 32.7 56.5   3.1 10.0 3.1 10.0     5.0 4.8 5.0 4.8
Percentage of payout for minimum growth target percentage                       147.00%         68.50% 138.60%        
Percentage of payout for maximum growth target percentage                       155.00%                    
Shares issued during the period related to performance shares earned             9,577                              
Additional compensation cost that would be recognized if all outstanding performance shares vested               $ 30.4   $ 30.4     $ 3.4   $ 3.4              
[1] (1) WTM performance share payments in 2012 for the 2009-2011 performance cycle ranged from147% to 155% of target. There were no payments made in 2011 for the 2008-2010 performance cycle; those performance shares did not meet the threshold performance goals and expired.
[2] (2) OneBeacon performance share payments also include accelerated payments resulting from the OneBeacon Personal Lines and Commercial Lines Transactions. The accelerated OneBeacon performance shares payments for the 2009-2011 and 2010-2012 performance cycles were on a pro rata basis and at a performance factor of 100%.
[3] (1) OneBeacon performance share payments in 2012 for the 2009-2011 performance cycle were at 138.6% of target. OneBeacon performance shares payments in 2011 for the 2008-2010 performance cycle were at 68.5% of target. Amounts include deposits into OneBeacon’s deferred compensation plan.
[4] (2) Amounts include changes in assumed forfeitures, as required under GAAP.
[5] (3) Amounts include changes in assumed forfeitures, as required under GAAP.