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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | $ 546.6 | $ 646.8 | $ 581.7 | $ 606.8
Included in Condensed Consolidated Statement of Operations | 0.4 | (5.1) | 1.0 | (15.8)
Included in Other Comprehensive Income (Loss) | 4.6 | (0.9) | 0.8 | 5.1
Purchases | 48.2 | 74.2 | 149.2 | 183.8
Settlements | (36.7) | (25.9) | (96.6) | (40.8)
Sales | (8.8) | (39.0) | (57.0) | (89.0)
Transfers into Level 3 | 6.4 | 4.1 | 6.4 | 4.1
Transfers out of Level 3 | (19.1) | (25.9) | (43.9) | (25.9)
Balance at End of Period | 541.6 | 628.3 | 541.6 | 628.3
Fair Value, Level 2 to level 3 Transfers, Amount | (6.4) | (4.1) | (6.4) | (4.1)
Fair Value, Level 3 to level 1 Transfers, Amount |  |  | (3.5) |
Fair Value, Level 3 to level 2 Transfers, Amount | (19.1) | (25.9) | (40.4) | (25.9)
Corporate Bonds and Notes [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 396.1 | 459.4 | 403.2 | 436.3
Included in Condensed Consolidated Statement of Operations | (0.8) | (7.0) | (4.7) | (15.8)
Included in Other Comprehensive Income (Loss) | 1.8 | (0.9) | 4.6 | 2.4
Purchases | 40.4 | 60.1 | 120.4 | 148.3
Settlements | (31.2) | (20.6) | (75.5) | (34.9)
Sales | (3.7) | (34.0) | (32.0) | (79.3)
Transfers into Level 3 | 0.0 | 0.0 | 0.0 | 0.0
Transfers out of Level 3 | (15.2) | (15.0) | (28.6) | (15.0)
Balance at End of Period | 387.4 | 442.0 | 387.4 | 442.0
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 0.0 | 0.0 | 3.8 | 0.0
Included in Condensed Consolidated Statement of Operations | 0.0 | 0.0 | (1.2) | 0.0
Included in Other Comprehensive Income (Loss) | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Settlements | 0.0 | 0.0 | (2.6) | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Transfers into Level 3 | 1.4 | 4.1 | 1.4 | 4.1
Transfers out of Level 3 | 0.0 | 0.0 | 0.0 | 0.0
Balance at End of Period | 1.4 | 4.1 | 1.4 | 4.1
Redeemable Preferred Stocks [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 0.1 | 2.9 | 0.6 | 3.8
Included in Condensed Consolidated Statement of Operations | 0.0 | 0.0 | 0.1 | 0.0
Included in Other Comprehensive Income (Loss) | 0.0 | 0.4 | (0.1) | 0.0
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Settlements | 0.0 | (2.4) | (0.5) | (2.9)
Sales | 0.0 | 0.0 | 0.0 | 0.0
Transfers into Level 3 | 0.0 | 0.0 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0 | 0.0 | 0.0
Balance at End of Period | 0.1 | 0.9 | 0.1 | 0.9
Collateralized Loan Obligations [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 95.4 | 102.2 | 103.5 | 87.3
Included in Condensed Consolidated Statement of Operations | 0.5 | 0.1 | 1.4 | (0.2)
Included in Other Comprehensive Income (Loss) | 0.0 | 5.2 | 1.7 | 3.0
Purchases | 6.3 | 13.9 | 22.7 | 33.2
Settlements | (5.5) | 0.0 | (18.0) | 0.0
Sales | (4.3) | 0.0 | (11.0) | (1.9)
Transfers into Level 3 | 5.0 | 0.0 | 5.0 | 0.0
Transfers out of Level 3 | (3.9) | (10.1) | (11.8) | (10.1)
Balance at End of Period | 93.5 | 111.3 | 93.5 | 111.3
Other Mortgage- and Asset-backed [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 3.7 |  | 3.8
Included in Condensed Consolidated Statement of Operations |  | 0.4 |  | 0.4
Included in Other Comprehensive Income (Loss) |  | (0.4) |  | (0.4)
Purchases |  | 0.0 |  | 0.0
Settlements |  | (2.9) |  | (3.0)
Sales |  | 0.0 |  | 0.0
Transfers into Level 3 |  | 0.0 |  | 0.0
Transfers out of Level 3 |  | (0.8) |  | (0.8)
Balance at End of Period |  | 0.0 |  | 0.0
Preferred and Common Stocks [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 22.8 | 31.4 | 29.7 | 30.0
Included in Condensed Consolidated Statement of Operations | 0.4 | 1.4 | 1.7 | 0.5
Included in Other Comprehensive Income (Loss) | 2.4 | 1.0 | 0.9 | 3.5
Purchases | 0.0 | 0.1 | 3.2 | 0.2
Settlements | 0.0 | 0.0 | 0.0 | 0.0
Sales | (0.5) | (2.9) | (6.9) | (3.2)
Transfers into Level 3 | 0.0 | 0.0 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0 | (3.5) | 0.0
Balance at End of Period | 25.1 | 31.0 | 25.1 | 31.0
Other Equity Interests [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 32.2 | 47.2 | 40.9 | 45.6
Included in Condensed Consolidated Statement of Operations | 0.3 | 0.0 | 3.7 | (0.7)
Included in Other Comprehensive Income (Loss) | 0.4 | (6.2) | (6.3) | (3.4)
Purchases | 1.5 | 0.1 | 2.9 | 2.1
Settlements | 0.0 | 0.0 | 0.0 | 0.0
Sales | (0.3) | (2.1) | (7.1) | (4.6)
Transfers into Level 3 | 0.0 | 0.0 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0 | 0.0 | 0.0
Balance at End of Period | $ 34.1 | $ 39.0 | $ 34.1 | $ 39.0

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