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Income Taxes (Deferred Tax Inventory) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Contingency [Line Items] |  |  |
Valuation allowance | $ 33,600,000 | $ 14,100,000 | $ (128,200,000)
Deferred income tax assets related to: |  |  |
Non-U.S. net operating loss carryforwards | 520,600,000 | 511,900,000 |
U.S. federal net operating and capital loss carryforwards | 148,600,000 | 164,800,000 |
Loss reserve discount | 74,900,000 | 88,600,000 |
Incentive compensation | 10,300,000 | 10,400,000 |
Unearned premiums | 38,900,000 | 45,500,000 |
Tax credit carryforwards | 23,100,000 | 17,000,000 |
Fixed assets | 4,900,000 | 2,800,000 |
Accrued interest | 1,100,000 | 8,000,000 |
Pension and benefit accruals | 0 | 10,300,000 |
Other items | 6,900,000 | 5,700,000 |
Total gross deferred income tax assets | 907,400,000 | 951,100,000 |
Less: valuation allowances | (289,800,000) | (254,000,000) |
Total net deferred income tax assets | 617,600,000 | 697,100,000 |
Deferred income tax liabilities related to: |  |  |
Net unrealized investment gains | 44,600,000 | 54,200,000 |
Investment basis difference | 3,000,000 | 21,000,000 |
Deferred acquisition costs | 33,000,000 | 49,800,000 |
Other items | 7,900,000 | 7,500,000 |
Total deferred income tax liabilities | 461,700,000 | 468,800,000 |
Net deferred tax asset | 155,900,000 | 228,300,000 |
OneBeacon Runoff |  |  |
Deferred income tax assets related to: |  |  |
Runoff Transaction | 24,200,000 | 49,300,000 |
Safety Reserve [Member] |  |  |
Deferred income tax liabilities related to: |  |  |
Deferred Tax Liabilities, Gross, Noncurrent | 357,200,000 | 326,700,000 |
Purchase Accounting [Member] |  |  |
Deferred income tax liabilities related to: |  |  |
Deferred Tax Liabilities, Gross, Noncurrent | 7,200,000 | 9,500,000 |
Members Surplus Contributions [Member] |  |  |
Deferred income tax liabilities related to: |  |  |
Deferred Tax Liabilities, Gross, Noncurrent | 5,400,000 | 100,000 |
Other Pension Plan, Postretirement or Supplemental Plans, Defined Benefit [Member] |  |  |
Deferred income tax liabilities related to: |  |  |
Deferred Tax Liabilities, Gross, Noncurrent | 3,400,000 | 0 |
Incentive Compensation [Member] |  |  |
Deferred income tax assets related to: |  |  |
Incentive compensation | 53,900,000 | 36,800,000 |
UNITED STATES |  |  |
Deferred income tax liabilities related to: |  |  |
Net deferred tax asset | 193,100,000 |  |
Luxembourg |  |  |
Deferred income tax liabilities related to: |  |  |
Net deferred tax asset | 315,700,000 |  |
UNITED KINGDOM |  |  |
Deferred income tax liabilities related to: |  |  |
Net deferred tax asset | 3,300,000 |  |
SWEDEN |  |  |
Deferred income tax liabilities related to: |  |  |
Total deferred income tax liabilities | $ 356,200,000 |  |

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