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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
SUPPLEMENTARY INSURANCE INFORMATION      
Net investment income of non-insurance operations $ 19.8 $ 14.8 $ 12.5
OneBeacon
      
SUPPLEMENTARY INSURANCE INFORMATION      
Deferred acquisition costs 123.5 114.5 215.0
Future policy benefits, losses, claims and loss expenses 3,358.6 3,295.5 3,934.8
Unearned premiums 528.0 627.5 1,018.3
Premiums earned 1,015.5 1,487.7 1,959.5
Net investment income 66.8 96.3 127.4
Benefits, claims, losses, and settlement expenses 580.9 930.2 1,121.9
Amortization of deferred policy acquisition costs 219.0 320.7 398.3
Other operating expenses 173.3 246.5 330.0
Premiums written 1,062.9 1,236.3 1,906.7
Sirius group
      
SUPPLEMENTARY INSURANCE INFORMATION      
Deferred acquisition costs 63.5 61.6 57.2
Future policy benefits, losses, claims and loss expenses 2,343.7 2,441.3 2,444.4
Unearned premiums 319.0 311.2 287.5
Premiums earned 912.3 847.9 858.8
Net investment income 89.9 90.5 107.7
Benefits, claims, losses, and settlement expenses 626.0 531.0 418.8
Amortization of deferred policy acquisition costs 181.0 167.5 170.9
Other operating expenses 105.8 99.8 98.1
Premiums written 915.7 865.8 806.8
Other Operations
      
SUPPLEMENTARY INSURANCE INFORMATION      
Net investment income $ 8.0 $ 1.3 $ (0.1)