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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
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 | 41.9 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 581.7 | $ 606.8
Included in Consolidated Statement of Income | 0.1 | (26.2)
Included in Other Comprehensive Income | 5.9 | 5.9
Purchases | 212.7 | 244.6
Settlements | (147.2) | (101.8)
Sales | (65.7) | (125.7)
Transfers Into Level 3 | 14.5 | 4.1
Transfers out of Level 3 | (45.4) | (26.0)
Balance at End of Year | 556.6 | 581.7
Corporate Bonds and Notes [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 403.2 | 436.3
Included in Consolidated Statement of Income | (5.7) | (23.0)
Included in Other Comprehensive Income | 4.9 | 0.9
Purchases | 171.0 | 203.7
Settlements | (110.6) | (85.4)
Sales | (40.8) | (114.5)
Transfers Into Level 3 | 8.1 | 0.0
Transfers out of Level 3 | (28.6) | (14.8)
Balance at End of Year | 401.5 | 403.2
States and Political Subdivisions [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 3.8 | 0.0
Included in Consolidated Statement of Income | (1.2) | (0.3)
Included in Other Comprehensive Income | 0.1 | 0.0
Purchases | 0.0 | 0.0
Settlements | (2.6) | 0.0
Sales | 0.0 | 0.0
Transfers Into Level 3 | 1.4 | 4.1
Transfers out of Level 3 | (1.5) | 0.0
Balance at End of Year | 0.0 | 3.8
Redeemable Preferred Stocks [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 0.6 | 3.8
Included in Consolidated Statement of Income | 0.1 | 0.0
Included in Other Comprehensive Income | (0.1) | 0.0
Purchases | 0.0 | 0.0
Settlements | (0.5) | (3.2)
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 | 0.1 | 0.6
Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 103.5 | 87.3
Included in Consolidated Statement of Income | 1.5 | 0.0
Included in Other Comprehensive Income | 2.4 | 4.3
Purchases | 34.0 | 29.1
Settlements | (33.5) | (5.0)
Sales | (7.9) | (1.9)
Transfers Into Level 3 | 5.0 | 0.0
Transfers out of Level 3 | (11.8) | (10.3)
Balance at End of Year | 93.2 | 103.5
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 | 3.8
Included in Consolidated Statement of Income | 0.0 | 0.4
Included in Other Comprehensive Income | 0.0 | (0.3)
Purchases | 0.0 | 0.0
Settlements | 0.0 | (3.0)
Sales | 0.0 | 0.0
Transfers Into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | (0.9)
Balance at End of Year | 0.0 | 0.0
Preferred and Common Stock [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 29.7 | 30.0
Included in Consolidated Statement of Income | 1.4 | (1.7)
Included in Other Comprehensive Income | 3.4 | 3.4
Purchases | 4.6 | 7.9
Settlements | 0.0 | (5.2)
Sales | (8.2) | (4.7)
Transfers Into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | (3.5) | 0.0
Balance at End of Year | 27.4 | 29.7
Other Equity Interests [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 40.9 | 45.6
Included in Consolidated Statement of Income | 4.0 | (1.6)
Included in Other Comprehensive Income | (4.8) | (2.4)
Purchases | 3.1 | 3.9
Settlements | 0.0 | 0.0
Sales | (8.8) | (4.6)
Transfers Into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0
Balance at End of Year | $ 34.4 | $ 40.9

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