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Discontinued Operations (Net Assets Held for Sale) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | --- | --- | ---
Assets held for sale |  |  |  |  |  |
Fixed maturity investments, at fair value | $ 4,785.5 |  | $ 5,030.5 |  |  |
Cash Including Restricted Cash | 543.5 |  | 382.8 |  |  |
Reinsurance recoverable on unpaid losses | 430.7 |  | 428.1 |  |  |
Reinsurance recoverable on paid losses | 27.2 |  | 25.4 |  |  |
Insurance and reinsurance premiums receivable | 677.8 |  | 518.9 |  |  |
Deferred acquisition costs | 204.4 |  | 174.7 |  |  |
Deferred tax asset | 439.1 |  | 512.1 |  |  |
Other assets | 466.7 |  | 458.1 |  |  |
Total assets | 12,188.3 |  | 12,144.3 |  |  |
Liabilities held for sale |  |  |  |  |  |
Loss and loss adjustment expense reserves | 3,022.9 | 3,053.3 | 3,079.3 | 3,108.1 | 3,057.9 | 3,168.9
Unearned insurance premiums | 1,089.5 |  | 901.4 |  |  |
Ceded reinsurance payable | 134.0 |  | 71.9 |  |  |
Other liabilities | 355.4 |  | 362.9 |  |  |
Total liabilities | 7,689.5 |  | 7,746.9 |  |  |
Segment, Discontinued Operations |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |
Fixed maturity investments, at fair value | 203.9 |  | 236.3 |  |  |
Reinsurance recoverable on unpaid losses | 1,458.4 |  | 1,604.7 |  |  |
Reinsurance recoverable on paid losses | 7.4 |  | 10.7 |  |  |
Insurance and reinsurance premiums receivable | 11.6 |  | 9.1 |  |  |
Deferred tax asset | 2.5 |  | 3.3 |  |  |
Other assets | 15.4 |  | 16.0 |  |  |
Total assets | 1,699.2 |  | 1,880.1 |  |  |
Liabilities held for sale |  |  |  |  |  |
Loss and loss adjustment expense reserves | 1,600.9 |  | 1,793.1 |  |  |
Unearned insurance premiums | 0 |  | 0.2 |  |  |
Ceded reinsurance payable | 12.1 |  | 12.3 |  |  |
Other liabilities | 86.2 |  | 74.5 |  |  |
Total liabilities | 1,699.2 |  | 1,880.1 |  |  |
Net assets held for sale | $ 0 |  | $ 0 |  |  |

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