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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment reporting information        
Earned insurance premiums $ 500.4 $ 536.8 $ 1,493.3 $ 1,545.3
Net investment income 27.3 37.6 84.5 119.8
Net investment income (loss) - surplus note interest 0 0 0 0
Net realized and unrealized investment gains (losses) 28.2 72.7 66.1 123.2
Other revenue 18.2 50.3 46.9 81.0
Total revenues 574.1 697.4 1,690.8 1,869.3
Losses and loss adjustment expenses 278.3 308.1 797.2 821.7
Insurance and reinsurance acquisition expenses 106.7 107.6 281.0 326.2
Other underwriting expenses 80.4 76.6 244.0 228.4
General and administrative expenses 41.5 58.7 125.5 146.3
Interest expense on debt 11.9 11.3 32.4 33.1
Total expenses 518.8 562.3 1,480.1 1,555.7
Pre-tax income (loss) 55.3 135.1 210.7 313.6
OneBeacon
        
Segment reporting information        
Earned insurance premiums 278.9 293.9 846.2 846.0
Net investment income 10.1 12.8 30.9 41.5
Net investment income (loss) - surplus note interest 0 0 0 0
Net realized and unrealized investment gains (losses) 17.0 40.0 19.9 57.9
Other revenue 5.5 (0.4) 30.1 (0.1)
Total revenues 311.5 346.3 927.1 945.3
Losses and loss adjustment expenses 167.8 164.7 473.7 452.5
Insurance and reinsurance acquisition expenses 53.6 66.6 160.9 185.6
Other underwriting expenses 46.8 47.4 150.7 146.2
General and administrative expenses 4.1 4.4 11.0 9.6
Interest expense on debt 3.3 4.1 9.8 12.2
Total expenses 275.6 287.2 806.1 806.1
Pre-tax income (loss) 35.9 59.1 121.0 139.2
Sirius
        
Segment reporting information        
Earned insurance premiums 221.4 242.9 646.9 699.3
Net investment income 13.5 16.7 38.0 50.9
Net investment income (loss) - surplus note interest 0 0 0 0
Net realized and unrealized investment gains (losses) (24.7) (8.9) (4.9) 22.9
Other revenue 16.8 48.2 11.3 48.9
Total revenues 227.0 298.9 691.3 822.0
Losses and loss adjustment expenses 110.5 143.4 323.5 369.2
Insurance and reinsurance acquisition expenses 52.5 41.0 119.0 140.6
Other underwriting expenses 33.5 29.1 93.0 82.1
General and administrative expenses 7.5 10.2 23.0 35.4
Interest expense on debt 6.6 6.5 19.7 19.6
Total expenses 210.6 230.2 578.2 646.9
Pre-tax income (loss) 16.4 68.7 113.1 175.1
HG Global
        
Segment reporting information        
Earned insurance premiums 0.1 0 0.2 0
Net investment income 0.2 0.1 0.7 0.1
Net investment income (loss) - surplus note interest 10.1 8.3 30.2 8.3
Net realized and unrealized investment gains (losses) 0.5 0.2 (1.7) 0.2
Other revenue 0 0 0 0
Total revenues 10.9 8.6 29.4 8.6
Losses and loss adjustment expenses 0 0 0 0
Insurance and reinsurance acquisition expenses 0.1 0 0.1 0
Other underwriting expenses 0 0 0 0
General and administrative expenses 0.3 3.8 1.1 3.8
Interest expense on debt 0 0 0 0
Total expenses 0.4 3.8 1.2 3.8
Pre-tax income (loss) 10.5 4.8 28.2 4.8
BAM
        
Segment reporting information        
Earned insurance premiums 0 0 0 0
Net investment income 1.1 0.6 3.3 0.6
Net investment income (loss) - surplus note interest (10.1) (8.3) (30.2) (8.3)
Net realized and unrealized investment gains (losses) 2.4 1.0 (8.1) 1.0
Other revenue 0.2 0 0.3 0
Total revenues (6.4) (6.7) (34.7) (6.7)
Losses and loss adjustment expenses 0 0 0 0
Insurance and reinsurance acquisition expenses 0.5 0 1.0 0
Other underwriting expenses 0.1 0.1 0.3 0.1
General and administrative expenses 8.1 11.2 24.2 11.2
Interest expense on debt 0 0 0 0
Total expenses 8.7 11.3 25.5 11.3
Pre-tax income (loss) (15.1) (18.0) (60.2) (18.0)
Other Operations
        
Segment reporting information        
Earned insurance premiums 0 0 0 0
Net investment income 2.4 7.4 11.6 26.7
Net investment income (loss) - surplus note interest 0 0 0 0
Net realized and unrealized investment gains (losses) 33.0 40.4 60.9 41.2
Other revenue (4.3) 2.5 5.2 32.2
Total revenues 31.1 50.3 77.7 100.1
Losses and loss adjustment expenses 0 0 0 0
Insurance and reinsurance acquisition expenses 0 0 0 0
Other underwriting expenses 0 0 0 0
General and administrative expenses 21.5 29.1 66.2 86.3
Interest expense on debt 2.0 0.7 2.9 1.3
Total expenses 23.5 29.8 69.1 87.6
Pre-tax income (loss) $ 7.6 $ 20.5 $ 8.6 $ 12.5