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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | $ 2,063.6 | $ 1,924.5 | $ 2,029.0
Net investment income |  |  |  |  |  |  |  |  | 153.6 | 184.5 | 208.9
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 0 |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 118.2 | 74.1 | 77.6
Other revenue |  |  |  |  |  |  |  |  | 100.3 | (10.0) | 18.2
Revenues (including realized gains and losses) | 566.4 | 697.4 | 542.3 | 629.7 | 593.4 | 501.7 | 552.4 | 525.6 | 2,435.7 | 2,173.1 | 2,333.7
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 1,193.9 | 1,174.3 | 1,216.6
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 430.2 | 402.2 | 419.6
Other underwriting expenses |  |  |  |  |  |  |  |  | 321.8 | 268.1 | 295.9
General and administrative expenses |  |  |  |  |  |  |  |  | 182.2 | 175.3 | 155.0
Interest expense on debt |  |  |  |  |  |  |  |  | 44.8 | 55.2 | 57.3
Total expenses | 617.2 | 562.3 | 504.7 | 488.8 | 495.0 | 500.5 | 516.6 | 563.0 | 2,172.9 | 2,075.1 | 2,144.4
Pre-tax income | (50.8) | 135.1 | 37.6 | 140.9 | 98.4 | 1.2 | 35.8 | (37.4) | 262.8 | 98.0 | 189.3
Percentage of par value of policy reinsured | 15.00% |  |  |  |  |  |  |  | 15.00% |  |
Sirius Group Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 931.6 | 912.3 | 847.9
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 543.9 | 626.0 | 531.0
OneBeacon |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 1,132.0 | 1,012.2 | 1,181.1
Net investment income |  |  |  |  |  |  |  |  | 53.6 | 71.4 | 96.6
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 0 |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 55.7 | 10.6 | 74.6
Other revenue |  |  |  |  |  |  |  |  | (0.5) | (12.4) | (0.6)
Revenues (including realized gains and losses) |  |  |  |  |  |  |  |  | 1,240.8 | 1,081.8 | 1,351.7
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 650.0 | 548.3 | 685.6
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 249.4 | 221.2 | 252.1
Other underwriting expenses |  |  |  |  |  |  |  |  | 205.2 | 162.3 | 196.1
General and administrative expenses |  |  |  |  |  |  |  |  | 13.4 | 9.8 | 12.9
Interest expense on debt |  |  |  |  |  |  |  |  | 16.9 | 20.5 | 29.6
Total expenses |  |  |  |  |  |  |  |  | 1,134.9 | 962.1 | 1,176.3
Pre-tax income |  |  |  |  |  |  |  |  | 105.9 | 119.7 | 175.4
Sirius Group |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 931.6 | 912.3 | 847.9
Net investment income |  |  |  |  |  |  |  |  | 65.0 | 89.9 | 96.5
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 0 |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 17.3 | 53.2 | (14.8)
Other revenue |  |  |  |  |  |  |  |  | 70.6 | 4.1 | 40.9
Revenues (including realized gains and losses) |  |  |  |  |  |  |  |  | 1,084.5 | 1,059.5 | 970.5
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 543.9 | 626.0 | 531.0
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 180.8 | 181.0 | 167.5
Other underwriting expenses |  |  |  |  |  |  |  |  | 116.4 | 105.8 | 99.8
General and administrative expenses |  |  |  |  |  |  |  |  | 45.9 | 34.1 | 31.6
Interest expense on debt |  |  |  |  |  |  |  |  | 26.2 | 31.6 | 26.6
Total expenses |  |  |  |  |  |  |  |  | 913.2 | 978.5 | 856.5
Pre-tax income |  |  |  |  |  |  |  |  | 171.3 | 81.0 | 114.0
BAM |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 0 |  |
Net investment income |  |  |  |  |  |  |  |  | 1.9 |  |
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | (18.4) |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 0 |  |
Other revenue |  |  |  |  |  |  |  |  | 0 |  |
Revenues (including realized gains and losses) |  |  |  |  |  |  |  |  | (16.5) |  |
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 0 |  |
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 0 |  |
Other underwriting expenses |  |  |  |  |  |  |  |  | 0.2 |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 19.6 |  |
Interest expense on debt |  |  |  |  |  |  |  |  | 0 |  |
Total expenses |  |  |  |  |  |  |  |  | 19.8 |  |
HG Global |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 0 |  |
Net investment income |  |  |  |  |  |  |  |  | 0.3 |  |
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 18.4 |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 0 |  |
Other revenue |  |  |  |  |  |  |  |  | 0 |  |
Revenues (including realized gains and losses) |  |  |  |  |  |  |  |  | 18.7 |  |
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 0 |  |
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 0 |  |
Other underwriting expenses |  |  |  |  |  |  |  |  | 0 |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 4.5 |  |
Interest expense on debt |  |  |  |  |  |  |  |  | 0 |  |
Total expenses |  |  |  |  |  |  |  |  | 4.5 |  |
Pre-tax income |  |  |  |  |  |  |  |  | 14.2 |  |
Percentage of par value of policy reinsured | 15.00% |  |  |  |  |  |  |  | 15.00% |  |
Other Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net investment income |  |  |  |  |  |  |  |  | 32.8 | 23.2 | 15.8
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 0 |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 45.2 | 10.3 | 17.8
Other revenue |  |  |  |  |  |  |  |  | 30.2 | (1.7) | (22.1)
Revenues (including realized gains and losses) |  |  |  |  |  |  |  |  | 108.2 | 31.8 | 11.5
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other underwriting expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  | 98.8 | 131.4 | 110.5
Interest expense on debt |  |  |  |  |  |  |  |  | 1.7 | 3.1 | 1.1
Total expenses |  |  |  |  |  |  |  |  | 100.5 | 134.5 | 111.6
Pre-tax income |  |  |  |  |  |  |  |  | 7.7 | (102.7) | (100.1)
Non-controlling Interests | Build America Mutual | BAM |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Pre-tax income |  |  |  |  |  |  |  |  | $ (36.3) |  |

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- Definition Amount of policy acquisition costs charged to expense in the period. Includes deferred policy acquisition costs amortized in the period, generally in proportion to related revenue earned over the policy or contract term. + References No definition available. + Details
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