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Debt (Details) (USD $) In Millions | 9 Months Ended |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  | 3 Months Ended |
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Sep. 30, 2010 | Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2011 OBH Senior Notes OneBeacon U.S. Holdings, Inc. ("OBH") | Dec. 31, 2010 OBH Senior Notes OneBeacon U.S. Holdings, Inc. ("OBH") | Apr. 30, 2011 OBH Senior Notes Tender offer. | Jun. 30, 2010 OBH Senior Notes Tender offer. | Dec. 31, 2010 OBH Senior Notes Additional repurchase and retirement of debt | Dec. 31, 2010 OBH Senior Notes Repurchase and retirement of debt | Sep. 30, 2011 Sirius Group Senior Notes | Dec. 31, 2010 Sirius Group Senior Notes | Sep. 30, 2011 WTM Bank Facility | Aug. 12, 2011 Previous revolving credit facility
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument at face value |  |  |  | $ 269.9 | $ 419.9 |  |  |  |  | $ 400.0 | $ 400.0 |  |
Unamortized original issue discount |  |  |  | (0.2) | (0.3) |  |  |  |  | (0.7) | (0.8) |  |
Total debt |  | 669.0 | 818.8 | 269.7 | 419.6 |  |  |  |  | 399.3 | 399.2 |  |
Aggregate principal amount of senior notes purchased and retired |  |  |  |  |  | 150.0 | 156.4 | 29.7 | 1.1 |  |  |  |
Aggregate purchase price of senior notes purchased and retired | 197.3 |  |  |  |  | 161.6 | 165.4 | 30.8 | 1.1 |  |  |  |
Loss on retirement of debt |  |  |  |  |  | 12.0 | 9.6 | 1.2 |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  |  |  |  |  |  |  | 375.0 | 475.0
Interest expense |  |  |  |  |  |  |  |  |  |  |  | $ 2.2 |

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