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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Level 3 to level 1 Transfers, Amount |  | $ 3.5
Fair Value, Level 3 to level 2 Transfers, Amount | $ 9.5 | (41.9)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 556.6 | 581.7
Included in Consolidated Statement of Income | 7.0 | 0.1
Included in Other Comprehensive Income | (18.4) | 5.9
Purchases | 663.3 | 212.7
Settlements | (166.6) | (147.2)
Sales | (109.5) | (65.7)
Transfers Into Level 3 | 36.3 | 14.5
Transfers out of Level 3 | (71.3) | (45.4)
Balance at End of Year | 897.4 | 556.6
Corporate Bonds and Notes [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 401.5 | 403.2
Included in Consolidated Statement of Income | 4.4 | (5.7)
Included in Other Comprehensive Income | (2.2) | 4.9
Purchases | 201.8 | 171.0
Settlements | (108.1) | (110.6)
Sales | (109.5) | (40.8)
Transfers Into Level 3 | 2.4 | 8.1
Transfers out of Level 3 | (7.7) | (28.6)
Balance at End of Year | 382.6 | 401.5
States and Political Subdivisions [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 0.0 | 3.8
Included in Consolidated Statement of Income | 0.0 | (1.2)
Included in Other Comprehensive Income | 0.0 | 0.1
Purchases | 1.8 | 0.0
Settlements | 0.0 | (2.6)
Sales | 0.0 | 0.0
Transfers Into Level 3 | 0.0 | 1.4
Transfers out of Level 3 | (1.8) | (1.5)
Balance at End of Year | 0.0 | 0.0
Redeemable Preferred Stocks [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 0.1 | 0.6
Included in Consolidated Statement of Income | (0.1) | 0.1
Included in Other Comprehensive Income | 0.0 | (0.1)
Purchases | 0.0 | 0.0
Settlements | 0.0 | 0.5
Sales | 0.0 | 0.0
Transfers Into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0
Balance at End of Year | 0.0 | 0.1
Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 93.2 | 103.5
Included in Consolidated Statement of Income | 2.7 | 1.5
Included in Other Comprehensive Income | (16.3) | 2.4
Purchases | 449.7 | 34.0
Settlements | (58.3) | (33.5)
Sales | 0.0 | 7.9
Transfers Into Level 3 | 33.9 | 5.0
Transfers out of Level 3 | 0.0 | 11.8
Balance at End of Year | 504.9 | 93.2
Other Mortgage and Asset-backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 0.0 | 0.0
Included in Consolidated Statement of Income | 0.0 | 0.0
Included in Other Comprehensive Income | 0.1 | 0.0
Purchases | 10.0 | 0.0
Settlements | 0.2 | 0.0
Sales | 0.0 | 0.0
Transfers Into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0
Balance at End of Year | 9.9 | 0.0
Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Transfers out of Level 3 | 61.8 |
Equity Securities, Investment Summary [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 27.4 | 29.7
Included in Consolidated Statement of Income | 0.0 | 1.4
Included in Other Comprehensive Income | 0.0 | 3.4
Purchases | 0.0 | 4.6
Settlements | 0.0 | 0.0
Sales | 0.0 | 8.2
Transfers Into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 27.4 | 3.5
Balance at End of Year | 0.0 | 27.4
Other Equity Interests [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 34.4 | 40.9
Included in Consolidated Statement of Income | 0.0 | 4.0
Included in Other Comprehensive Income | 0.0 | (4.8)
Purchases | 0.0 | 3.1
Settlements | 0.0 | 0.0
Sales | 0.0 | (8.8)
Transfers Into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | (34.4) | 0.0
Balance at End of Year | $ 0.0 | $ 34.4

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