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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period $ 965.0 $ 481.4 $ 897.4 $ 556.6
Total Gains (Losses):        
Included in Condensed Consolidated Statement of Operations 2.1 1.4 (5.5) 4.6
Included in Other Comprehensive Income (Loss) (3.9) (1.1) 14.8 (3.0)
Purchases 65.8 420.9 251.4 552.2
Settlements (15.2) (28.0) (43.6) (128.4)
Sales (19.0) (47.8) (137.6) (88.7)
Transfers into Level 3 0.0 35.9 19.5 36.2
Transfers out of Level 3 0.0 (2.7) (1.6) (69.5)
Balance at End of Period 994.8 860.0 994.8 860.0
Bonds and Notes        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 415.6 385.5 382.6 401.5
Total Gains (Losses):        
Included in Condensed Consolidated Statement of Operations 1.7 0.9 (6.0) 2.3
Included in Other Comprehensive Income (Loss) (0.8) 0.0 9.4 0.1
Purchases 35.1 54.9 196.5 148.6
Settlements (7.4) (11.5) (23.5) (77.1)
Sales (19.0) (47.8) (134.7) (88.7)
Transfers into Level 3 0.0 2.0 2.5 2.3
Transfers out of Level 3 0.0 (2.7) (1.6) (7.7)
Balance at End of Period 425.2 381.3 425.2 381.3
States and Political Subdivisions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 0.0 0.0   0.0
Total Gains (Losses):        
Included in Condensed Consolidated Statement of Operations 0.0 0.0 0.0 0.0
Included in Other Comprehensive Income (Loss) 0.0 0.0 0.0 0.0
Purchases 1.9 1.8 1.9 1.8
Settlements 0.0 0.0 0.0 0.0
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 1.9 1.8 1.9 1.8
Redeemable Preferred Stocks        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period       0.1
Total Gains (Losses):        
Included in Condensed Consolidated Statement of Operations       (0.1)
Included in Other Comprehensive Income (Loss)       0.0
Purchases       0.0
Settlements       0.0
Sales       0.0
Transfers into Level 3       0.0
Transfers out of Level 3       0.0
Balance at End of Period   0.0   0.0
Collateralized Loan Obligations        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 539.0 95.9 504.9 93.2
Total Gains (Losses):        
Included in Condensed Consolidated Statement of Operations 0.4 0.5 0.5 2.4
Included in Other Comprehensive Income (Loss) (3.5) (1.3) 4.2 (3.3)
Purchases 8.2 354.2 32.4 391.8
Settlements (7.6) (16.5) (19.6) (51.3)
Sales 0.0 0.0 (2.9) 0.0
Transfers into Level 3 0.0 33.9 17.0 33.9
Transfers out of Level 3 0.0 0.0 0.0 0.0
Balance at End of Period 536.5 466.7 536.5 466.7
Other Mortgage- and Asset-backed        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 10.4 0.0 9.9 0.0
Total Gains (Losses):        
Included in Condensed Consolidated Statement of Operations 0.0 0.0 0.0 0.0
Included in Other Comprehensive Income (Loss) 0.4 0.2 1.2 0.2
Purchases 20.6 10.0 20.6 10.0
Settlements (0.2) 0.0 (0.5) 0.0
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 $ 31.2 10.2 $ 31.2 10.2
Preferred and Common Stocks        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period       27.4
Total Gains (Losses):        
Included in Condensed Consolidated Statement of Operations       0.0
Included in Other Comprehensive Income (Loss)       0.0
Purchases       0.0
Settlements       0.0
Sales       0.0
Transfers into Level 3       0.0
Transfers out of Level 3       (27.4)
Balance at End of Period   0.0   0.0
Other Equity Interests        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period       34.4
Total Gains (Losses):        
Included in Condensed Consolidated Statement of Operations       0.0
Included in Other Comprehensive Income (Loss)       0.0
Purchases       0.0
Settlements       0.0
Sales       0.0
Transfers into Level 3       0.0
Transfers out of Level 3       (34.4)
Balance at End of Period   $ 0.0   $ 0.0