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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period $ 191,900,000 $ 210,200,000 $ 192,300,000 $ 230,000,000.0
Included in Condensed Consolidated Statement of Operations 2,000,000.0 (800,000) 1,700,000 (900,000)
Included in Other Comprehensive Income (Loss) (1,800,000) 700,000 0 2,400,000
Purchases 68,600,000 19,600,000 81,800,000 39,000,000.0
Sales (14,300,000) (28,100,000) (18,000,000.0) (69,300,000)
Transfers into Level 3 3,100,000 0 4,800,000 400,000
Transfers out of Level 3 (2,800,000) (100,000) (15,900,000) (100,000)
Balance, End of Period 246,700,000 201,500,000 246,700,000 201,500,000
Corporate Bonds and Notes        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 180,500,000 196,100,000 177,100,000 216,000,000.0
Included in Condensed Consolidated Statement of Operations 100,000 100,000 (100,000) 500,000
Included in Other Comprehensive Income (Loss) (1,700,000) 900,000 600,000 2,400,000
Purchases 59,400,000 18,500,000 72,600,000 37,900,000
Sales (12,600,000) (28,100,000) (16,300,000) (69,300,000)
Transfers into Level 3 3,100,000 0 3,100,000 0
Transfers out of Level 3 (1,500,000) (100,000) (9,700,000) (100,000)
Balance, End of Period 227,300,000 187,400,000 227,300,000 187,400,000
States and Political Subdivisions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 1,400,000   100,000  
Included in Condensed Consolidated Statement of Operations 0   0  
Included in Other Comprehensive Income (Loss) 0   (400,000)  
Purchases 0   0  
Sales 0   0  
Transfers into Level 3 0   1,700,000  
Transfers out of Level 3 (1,300,000)   (1,300,000)  
Balance, End of Period 100,000   100,000  
Redeemable Preferred Stocks        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 2,200,000 6,800,000 7,100,000 6,800,000
Included in Condensed Consolidated Statement of Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) 0 (100,000) 0 (100,000)
Purchases 1,900,000 0 1,900,000 0
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 (4,900,000) 0
Balance, End of Period 4,100,000 6,700,000 4,100,000 6,700,000
Collateralized Loan Obligations        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 0   0  
Included in Condensed Consolidated Statement of Operations 0   0  
Included in Other Comprehensive Income (Loss) 0   0  
Purchases 6,800,000   6,800,000  
Sales 0   0  
Transfers into Level 3 0   0  
Transfers out of Level 3 0   0  
Balance, End of Period 6,800,000   6,800,000  
Other Mortgage- and Asset-backed        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 5,100,000 5,300,000 5,200,000 5,100,000
Included in Condensed Consolidated Statement of Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) (100,000) (100,000) (200,000) 100,000
Purchases 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, End of Period 5,000,000.0 5,200,000 5,000,000.0 5,200,000
Equity Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 2,700,000 2,000,000.0 2,800,000 2,100,000
Included in Condensed Consolidated Statement of Operations 1,900,000 (900,000) 1,800,000 (1,400,000)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 500,000 1,100,000 500,000 1,100,000
Sales (1,700,000) 0 (1,700,000) 0
Transfers into Level 3 0 0 0 400,000
Transfers out of Level 3 0 0 0 0
Balance, End of Period $ 3,400,000 $ 2,200,000 $ 3,400,000 $ 2,200,000