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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at Beginning of Year $ 449.2 $ 1,044.2
Total Gains (Losses):    
Included in Condensed Consolidated Statement of Operations (1.1) (3.0)
Included in Other Comprehensive Income (Loss) (5.0) (34.8)
Purchases 17.8 81.4
Settlements 0.0 0.0
Sales (31.1) (44.8)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 (0.6) (557.7)
Balance at End of Period 429.2 485.3
Bonds and Notes    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at Beginning of Year 433.0 409.1
Total Gains (Losses):    
Included in Condensed Consolidated Statement of Operations (1.1) (2.7)
Included in Other Comprehensive Income (Loss) (3.7) (24.8)
Purchases 17.8 27.2
Settlements 0.0 0.0
Sales (30.9) (18.2)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 (0.6) 0.0
Balance at End of Period 414.5 390.6
States and Political Subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at Beginning of Year 0.0 0.0
Total Gains (Losses):    
Included in Condensed Consolidated Statement of Operations 0.0 0.0
Included in Other Comprehensive Income (Loss) 0.0 0.1
Purchases 0.0 0.6
Settlements 0.0 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 Period 0.0 0.7
Redeemable Preferred Stocks    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at Beginning of Year 6.2 6.7
Total Gains (Losses):    
Included in Condensed Consolidated Statement of Operations 0.0  
Included in Other Comprehensive Income (Loss) (0.5)  
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 5.7 6.7
Collateralized Loan Obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at Beginning of Year 0.0 618.2
Total Gains (Losses):    
Included in Condensed Consolidated Statement of Operations 0.0 (0.3)
Included in Other Comprehensive Income (Loss) 0.0 (9.5)
Purchases 0.0 53.6
Settlements 0.0 0.0
Sales 0.0 (26.4)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 (557.7)
Balance at End of Period 0.0 77.9
Other Mortgage- and Asset-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at Beginning of Year 10.0 10.2
Total Gains (Losses):    
Included in Condensed Consolidated Statement of Operations 0.0 0.0
Included in Other Comprehensive Income (Loss) (0.8) (0.6)
Purchases 0.0 0.0
Settlements 0.0 0.0
Sales (0.2) (0.2)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Balance at End of Period $ 9.0 $ 9.4