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Significant Transactions (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Oct. 31, 2011
Esurance
Dec. 31, 2011
AutoOne
Jul. 31, 2010
One Beacon Personal Lines
entity
Y
Jun. 30, 2011
One Beacon Personal Lines
Dec. 31, 2010
One Beacon Personal Lines
Dec. 31, 2009
One Beacon Personal Lines
Dec. 31, 2009
OneBeacon Commercial Lines
Dec. 31, 2011
OneBeacon Commercial Lines
Dec. 31, 2010
OneBeacon Commercial Lines
Significant Transactions                        
Consideration in excess of tangible book value       $ 700                
Consideration from sale of business 1,010.6 188.3       166.6       23.2 0.8 10.2
Number of insurance companies sold           2            
Ceded share of traditional personal lines business (as a percent)           100.00%            
Assumed risk, certain specialty lines business written by York (as a percent)           100.00%            
Number of attorneys-in-fact sold           2            
Transition Service Agreement period (in years)           3            
Gain on sale of business in discontinued operations 677.5     677.5                
Loss on sale of business in discontinued operations 19.2       19.2              
Gain (loss) from sale of business, net of tax               24.6        
Gain (loss) on disposal of business before tax               8.5        
Tax benefit from disposal of business         10.4   5.6 16.1        
Written premiums for business sold, net 1,978.6 2,024.8 2,624.6           420.0      
Value of renewal rights sold in premiums                   $ 490   $ 200
Discount rate utilized for the revaluation of the plan obligations (as a percent) 4.38% 4.94%