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Employee Share-Based Incentive Compensation Plans (WTM Restricted Shares) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2012
Restricted Share Cliff Vesting in January 2015
Sep. 30, 2012
Restricted Share Cliff Vesting in January 2015
Dec. 31, 2012
Restricted Share Cliff Vesting in July 2015
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2010
Restricted Stock
Mar. 31, 2007
Restricted Stock
Chief Executive Officer
Dec. 31, 2010
Restricted Stock
Chief Executive Officer
Installment
Dec. 31, 2012
Restricted Share Vesting Beginning in February 2014
Mar. 31, 2012
Restricted Share Vesting Beginning in February 2014
Installment
Jun. 30, 2011
Restricted Share Cliff Vesting in January 2014
Mar. 31, 2011
Restricted Share Cliff Vesting in January 2014
Mar. 31, 2010
Restricted Share Vested in December 2012
May 31, 2010
Non-Qualified Options
Target Performance Share activity                                  
Beginning of period (in shares)             72,000 46,250 91,900                
Issued (in shares) 32,160 27,250 19,750 25,460 2,500 1,200 32,160 27,250 19,750 15,000   3,000   250 27,000 19,750  
Vested (in shares)             (32,945) (1,500) (65,150)                
Assumed forfeitures and cancellations (in shares)             (1,305) 0 (250)                
Ending of period (in shares)             69,910 72,000 46,250                
Unamortized grant date fair value                                  
Beginning balance             $ 13.3 $ 14.1 $ 23.7                
Issued             15.7 9.9 6.7                
Assumed forfeitures and cancelations             (0.2) 0 (0.1)                
Modified             0 [1] 0 [1] (3.3) [1]                
Expense recognized             (12.0) (10.7) (12.9)               (8.7)
Ending balance             $ 16.8 $ 13.3 $ 14.1                
Number of installments in which the shares vest                     3            
Number of restricted shares installments                         2        
[1] During the first quarter of 2007, White Mountains issued 15,000 restricted shares to the Company’s Chairman and CEO in connection with his hiring that would vest in the event of a change in control of the Company before January 20, 2012. During 2010, the Compensation Committee modified the vesting terms so that the 15,000 restricted shares time vest in three equal annual installments beginning on January 20, 2013. During 2012, the Compensation Committee accelerated the vesting date of the first installment from January 20, 2013 to December 31, 2012.