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Discontinued Operations (Assets and Liabilities Classified as Held for Sale) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Assets held for sale |  |  |  |
Fixed maturity investments, at fair value | $ 5,030.5 | $ 5,196.2 |  |
Cash | 382.8 | 462.4 |  |
Insurance and reinsurance premiums receivable | 518.9 | 556.3 |  |
Deferred acquisition costs | 174.7 | 195.3 |  |
Deferred tax asset | 155.9 | 228.3 |  |
Other assets | 458.1 | 503.0 |  |
Total assets | 12,144.3 | 12,895.4 |  |
Liabilities held for sale |  |  |  |
Loss and loss adjustment expense reserves | 3,079.3 | 3,168.9 | 5,702.3 | 5,736.8
Unearned insurance premiums | 901.4 | 924.1 |  |
Ceded reinsurance payable | 71.9 | 116.5 |  |
Other liabilities | 362.9 | 452.8 |  |
Total liabilities | 7,746.9 | 8,637.2 |  |
Reinsurance recoverable on unpaid losses | 428.1 | 429.1 |  |
Reinsurance recoverable on paid losses | 25.4 | 17.9 |  |
Discontinued Operations |  |  |  |
Assets held for sale |  |  |  |
Fixed maturity investments, at fair value | 236.3 | 338.1 |  |
Cash | 0 | 0 |  |
Insurance and reinsurance premiums receivable | 9.1 | 11.0 |  |
Deferred acquisition costs | 0 | 0 |  |
Deferred tax asset | 3.3 | 5.1 |  |
Other assets | 16.0 | 16.2 |  |
Total assets | 1,880.1 | 2,226.8 |  |
Liabilities held for sale |  |  |  |
Loss and loss adjustment expense reserves | 1,793.1 | 2,052.6 |  |
Unearned insurance premiums | 0.2 | 0.5 |  |
Ceded reinsurance payable | 12.3 | 21.9 |  |
Other liabilities | 74.5 | 151.8 |  |
Total liabilities | 1,880.1 | 2,226.8 |  |
Net assets held for sale | 0 | 0 |  |
Reinsurance recoverable on unpaid losses | 1,604.7 | 1,840.8 |  |
Reinsurance recoverable on paid losses |  | $ 15.6 |  |

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