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Discontinued Operations (Net Assets Held for Sale) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Assets held for sale |  |  |  |
Fixed maturity investments, at fair value | $ 4,854.4 | $ 5,196.2 |  |
Cash | 411.5 | 462.4 |  |
Reinsurance recoverable on unpaid losses | 410.8 | 429.1 | 2,465.4 | 2,507.3
Reinsurance recoverable on paid losses | 15.6 | 17.9 |  |
Insurance premiums receivable | 717.6 | 556.3 |  |
Deferred acquisition costs | 190.4 | 195.3 |  |
Deferred tax asset | 539.1 | 569.6 |  |
Other assets | 416.5 | 503.0 |  |
Total assets | 12,611.5 | 12,895.4 |  |
Liabilities held for sale |  |  |  |
Loss and loss adjustment expense reserves | 3,100.6 | 3,168.9 | 5,510.8 | 5,702.3
Unearned insurance premiums | 1,064.9 | 924.1 |  |
Ceded reinsurance payable | 175.7 | 116.5 |  |
Other liabilities | 374.4 | 452.8 |  |
Total liabilities | 8,329.5 | 8,637.2 |  |
Segment, Discontinued Operations |  |  |  |
Assets held for sale |  |  |  |
Fixed maturity investments, at fair value | 296.9 | 338.1 |  |
Cash | 0 | 0 |  |
Reinsurance recoverable on unpaid losses | 1,814.1 | 1,840.8 |  |
Reinsurance recoverable on paid losses | 14.1 | 15.6 |  |
Insurance premiums receivable | 9.9 | 11.0 |  |
Deferred acquisition costs | 0 | 0 |  |
Deferred tax asset | 4.2 | 5.1 |  |
Other assets | 16.0 | 16.2 |  |
Total assets | 2,155.2 | 2,226.8 |  |
Liabilities held for sale |  |  |  |
Loss and loss adjustment expense reserves | 1,980.2 | 2,052.6 |  |
Unearned insurance premiums | 0.5 | 0.5 |  |
Ceded reinsurance payable | 23.5 | 21.9 |  |
Other liabilities | 151.0 | 151.8 |  |
Total liabilities | 2,155.2 | 2,226.8 |  |
Net assets held for sale | $ 0 | $ 0 |  |

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