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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Segment reporting information    
Earned insurance and reinsurance premiums $ 499.0 $ 467.8
Net investment income 41.8 49.5
Net realized and unrealized investment gains 58.6 (9.2)
Other revenue 31.2 21.5
Total revenues 630.6 529.6
Loss and loss adjustment expenses 262.7 358.4
Insurance and reinsurance acquisition expenses 108.4 90.7
Other underwriting expenses 74.8 73.1
General and administrative expenses 45.5 28.0
Interest expense on debt 10.9 13.1
Total expenses 502.3 563.3
Pre-tax income (loss) from continuing operations 128.3 (33.7)
OneBeacon
    
Segment reporting information    
Earned insurance and reinsurance premiums 272.8 245.1
Net investment income 14.7 21.0
Net realized and unrealized investment gains 29.8 23.1
Other revenue 0.1 0.8
Total revenues 317.4 290.0
Loss and loss adjustment expenses 149.3 130.4
Insurance and reinsurance acquisition expenses 57.4 49.0
Other underwriting expenses 48.8 49.3
General and administrative expenses 2.7 2.3
Interest expense on debt 4.1 6.3
Total expenses 262.3 237.3
Pre-tax income (loss) from continuing operations 55.1 52.7
Sirius
    
Segment reporting information    
Earned insurance and reinsurance premiums 226.2 222.7
Net investment income 17.1 23.5
Net realized and unrealized investment gains 13.7 (36.1)
Other revenue 18.3 24.9
Total revenues 275.3 235.0
Loss and loss adjustment expenses 113.4 228.0
Insurance and reinsurance acquisition expenses 51.0 41.7
Other underwriting expenses 26.0 23.8
General and administrative expenses 18.9 6.7
Interest expense on debt 6.5 6.5
Total expenses 215.8 306.7
Pre-tax income (loss) from continuing operations 59.5 (71.7)
Other Operations
    
Segment reporting information    
Net investment income 10.0 5.0
Net realized and unrealized investment gains 15.1 3.8
Other revenue 12.8 (4.2)
Total revenues 37.9 4.6
General and administrative expenses 23.9 19.0
Interest expense on debt 0.3 0.3
Total expenses 24.2 19.3
Pre-tax income (loss) from continuing operations $ 13.7 $ (14.7)