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Fair Value - Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | $ 15,255.0 |
U.S. government securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 1,688.0 |
States, municipalities and political subdivisions |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 2,399.0 |
U.S. corporate securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 6,489.0 |
Foreign securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 2,383.0 |
Residential mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 577.0 |
Commercial mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 605.0 |
Other asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 1,085.0 |
Redeemable preferred securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 29.0 |
Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 15,255.0 | $ 111.0
Equity securities | 73.0 |
Equity securities |  | 0.0
Derivative financial instruments |  | 5.0
Total assets | 15,328.0 | 116.0
Liabilities: |  |
Derivative financial instruments |  | 23.0
Recurring | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 1,597.0 | 0.0
Equity securities | 19.0 |
Equity securities |  | 0.0
Derivative financial instruments |  | 0.0
Total assets | 1,616.0 | 0.0
Liabilities: |  |
Derivative financial instruments |  | 0.0
Recurring | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 13,581.0 | 111.0
Equity securities | 0.0 |
Equity securities |  | 0.0
Derivative financial instruments |  | 5.0
Total assets | 13,581.0 | 116.0
Liabilities: |  |
Derivative financial instruments |  | 23.0
Recurring | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 77.0 | 0.0
Equity securities | 54.0 |
Equity securities |  | 0.0
Derivative financial instruments |  | 0.0
Total assets | 131.0 | 0.0
Liabilities: |  |
Derivative financial instruments |  | 0.0
Recurring | Brokered Securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 50.0 |
Recurring | U.S. government securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 1,688.0 |
Recurring | U.S. government securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 1,597.0 |
Recurring | U.S. government securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 91.0 |
Recurring | U.S. government securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | States, municipalities and political subdivisions |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 2,399.0 |
Recurring | States, municipalities and political subdivisions | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | States, municipalities and political subdivisions | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 2,399.0 |
Recurring | States, municipalities and political subdivisions | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | U.S. corporate securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 6,489.0 | 1.0
Recurring | U.S. corporate securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 | 0.0
Recurring | U.S. corporate securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 6,422.0 | 1.0
Recurring | U.S. corporate securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 67.0 | 0.0
Recurring | Foreign securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 2,383.0 | 110.0
Recurring | Foreign securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 | 0.0
Recurring | Foreign securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 2,380.0 | 110.0
Recurring | Foreign securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 3.0 | $ 0.0
Recurring | Residential mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 577.0 |
Recurring | Residential mortgage-backed securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | Residential mortgage-backed securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 577.0 |
Recurring | Residential mortgage-backed securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | Commercial mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 605.0 |
Recurring | Commercial mortgage-backed securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | Commercial mortgage-backed securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 605.0 |
Recurring | Commercial mortgage-backed securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | Other asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 1,085.0 |
Recurring | Other asset-backed securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | Other asset-backed securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 1,085.0 |
Recurring | Other asset-backed securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | Redeemable preferred securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 29.0 |
Recurring | Redeemable preferred securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 0.0 |
Recurring | Redeemable preferred securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | 22.0 |
Recurring | Redeemable preferred securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total debt securities | $ 7.0 |

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