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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period $ 346,200,000 $ 246,700,000 $ 209,000,000.0 $ 192,300,000
Included in Condensed Consolidated Statement of Operations (1,500,000) 100,000 1,900,000 1,800,000
Included in Other Comprehensive Income (Loss) (3,600,000) 2,000,000.0 (1,000,000.0) 2,000,000.0
Purchases 110,900,000 30,900,000 368,100,000 112,700,000
Sales (65,400,000) (31,800,000) (147,700,000) (49,800,000)
Transfers into Level 3 1,700,000 5,700,000 16,700,000 10,500,000
Transfers out of Level 3 (54,300,000) (8,700,000) (113,000,000.0) (24,600,000)
Balance, End of Period 334,000,000.0 244,900,000 334,000,000.0 244,900,000
Corporate Bonds and Notes        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 261,600,000 227,300,000 194,200,000 177,100,000
Included in Condensed Consolidated Statement of Operations 400,000 300,000 1,900,000 200,000
Included in Other Comprehensive Income (Loss) (4,800,000) 1,700,000 (2,100,000) 2,300,000
Purchases 87,600,000 30,900,000 216,500,000 103,500,000
Sales (64,100,000) (31,800,000) (134,600,000) (48,100,000)
Transfers into Level 3 0 3,900,000 5,000,000.0 7,000,000.0
Transfers out of Level 3 0 (1,900,000) (200,000) (11,600,000)
Balance, End of Period 280,700,000 230,400,000 280,700,000 230,400,000
Foreign Governments        
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 5,000,000.0   5,000,000.0  
Sales (2,500,000)   (2,500,000)  
Transfers into Level 3 0   0  
Transfers out of Level 3 0   0  
Balance, End of Period 2,500,000   2,500,000  
States and Political Subdivisions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 200,000 100,000 1,800,000 100,000
Included in Condensed Consolidated Statement of Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) (100,000) (200,000) (200,000) (600,000)
Purchases 0 0 0 0
Sales 0 0 0 0
Transfers into Level 3 1,700,000 1,800,000 1,700,000 3,500,000
Transfers out of Level 3 0 0 (1,500,000) (1,300,000)
Balance, End of Period 1,800,000 1,700,000 1,800,000 1,700,000
Redeemable Preferred Stocks        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 4,300,000 4,100,000 4,200,000 7,100,000
Included in Condensed Consolidated Statement of Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) 100,000 200,000 200,000 200,000
Purchases 0 0 0 1,900,000
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 (4,900,000)
Balance, End of Period 4,400,000 4,300,000 4,400,000 4,300,000
Collateralized Loan Obligations        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 52,800,000 6,800,000 0 0
Included in Condensed Consolidated Statement of Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 5,700,000 0 125,500,000 6,800,000
Sales 0 0 (10,000,000.0) 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (52,800,000) (6,800,000) (109,800,000) (6,800,000)
Balance, End of Period 5,700,000 0 5,700,000 0
Other Mortgage- and Asset-backed        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 22,500,000 5,000,000.0 5,000,000.0 5,200,000
Included in Condensed Consolidated Statement of Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) 800,000 300,000 700,000 100,000
Purchases 13,100,000 0 20,800,000 0
Sales 0 0 (100,000) 0
Transfers into Level 3 0 0 10,000,000.0 0
Transfers out of Level 3 (1,500,000) 0 (1,500,000) 0
Balance, End of Period 34,900,000 5,300,000 34,900,000 5,300,000
Equity Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 4,800,000 3,400,000 3,800,000 2,800,000
Included in Condensed Consolidated Statement of Operations (1,900,000) (200,000) 0 1,600,000
Included in Other Comprehensive Income (Loss) 400,000 0 400,000 0
Purchases (500,000) 0 300,000 500,000
Sales 1,200,000 0 (500,000) (1,700,000)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of Period $ 4,000,000.0 $ 3,200,000 $ 4,000,000.0 $ 3,200,000