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Commitments, Guarantees and Contingent Liabilities - New Jersey and North Carolina (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss Contingencies |  |  |  |
Property and casualty insurance claims | $ 21,929.0 |  | $ 22,221.0 | $ 21,034.0
Earned premiums | 35,115.0 |  | $ 34,015.0 | $ 32,915.0
North Carolina Reinsurance Facility |  |  |  |
Loss Contingencies |  |  |  |
Reinsurance recoverables on paid claims | 12.5 |  |  |
Reinsurance recoverables on unpaid claims | 73.8 |  |  |
Fund's surplus to cover future losses |  | $ 310.0 |  |
Property and casualty insurance claims |  | 50.0 |  |
Earned premiums |  | 1,000.0 |  |
Clean risk recoupment |  | 173.0 |  |
Member loss recoupments |  | $ 149.0 |  |
North Carolina Joint Underwriters Association |  |  |  |
Loss Contingencies |  |  |  |
Plan surplus receivable | 4.6 |  |  |
Funds surplus in member's equity | 37.8 |  |  |
North Carolina Insurance Underwriting Association |  |  |  |
Loss Contingencies |  |  |  |
Funds surplus in member's equity | 1,500.0 |  |  |
Maximum possible assessment | $ 1,000.0 |  |  |
Percentage of surcharge on property insurance policy statewide to be remitted to the plan | 10.00% |  |  |

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