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Discontinued Operations (Assets and Liabilities Classified as Held for Sale) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Assets held for sale |  |  |  |
Fixed maturity investments, at fair value | $ 5,196.2 | $ 6,221.9 |  |
Cash | 462.4 | 705.4 |  |
Reinsurance recoverable on unpaid losses | 429.1 | 2,507.3 | 2,344.0 | 2,771.5
Reinsurance recoverable on paid losses | 17.9 | 30.5 |  |
Insurance and reinsurance premiums receivable | 556.3 | 489.2 |  |
Deferred acquisition costs | 195.3 | 187.0 |  |
Deferred tax asset | 569.6 | 536.9 |  |
Other assets | 503.0 | 681.9 |  |
Total assets | 12,895.4 | 14,064.0 |  |
Liabilities held for sale |  |  |  |
Loss and loss adjustment expense reserves | 3,168.9 | 5,702.3 | 5,736.8 | 6,379.2
Unearned insurance premiums | 924.1 | 846.9 |  |
Ceded reinsurance payable | 116.5 | 134.6 |  |
Other liabilities | 452.8 | 527.8 |  |
Total liabilities | 8,637.2 | 9,396.1 |  |
Discontinued Operations |  |  |  |
Assets held for sale |  |  |  |
Fixed maturity investments, at fair value | 338.1 | 111.8 |  |
Cash | 0 | 5.5 |  |
Reinsurance recoverable on unpaid losses | 1,840.8 | 0 |  |
Reinsurance recoverable on paid losses | 15.6 | 0 |  |
Insurance and reinsurance premiums receivable | 11.0 | 8.8 |  |
Deferred acquisition costs | 0 | 2.2 |  |
Deferred tax asset | 5.1 | 1.9 |  |
Other assets | 16.2 | 2.4 |  |
Total assets | 2,226.8 | 132.6 |  |
Liabilities held for sale |  |  |  |
Loss and loss adjustment expense reserves | 2,052.6 | 64.7 |  |
Unearned insurance premiums | 0.5 | 34.1 |  |
Ceded reinsurance payable | 21.9 | 0 |  |
Other liabilities | 151.8 | 8.8 |  |
Total liabilities | 2,226.8 | 107.6 |  |
Net assets held for sale | $ 0 | $ 25.0 |  |

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