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SCHEDULE II - Condensed Financial Information of Registrant (Parent Company) - Statement of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues:                      
Net investment income                 $ 1,748.8 $ 1,499.7 $ 1,015.9
Net investment losses                 (75.6) (69.3) (17.9)
Total revenues $ 1,097.2 $ 1,129.6 $ 1,066.2 $ 1,156.5 $ 1,170.5 $ 947.5 $ 1,022.8 $ 1,006.0 4,449.5 4,146.8 3,576.8
Expenses:                      
Income tax benefit 44.4 1.7 34.3 33.9 9.8 48.3 22.4 (0.2) 114.3 80.3 185.9
Net income $ 166.1 $ 9.3 $ 116.3 $ 112.3 $ 36.3 $ 167.3 $ 73.7 $ (0.8) 404.0 276.5 630.6
Parent Company                      
Revenues:                      
Net investment income                 37.0 13.3 9.8
Net investment income - affiliated                 1.1 3.7 3.0
Net investment losses                 0.0 0.1 (0.6)
Total revenues                 38.1 17.1 12.2
Expenses:                      
Interest expense                 91.8 62.7 62.5
Intercompany expenses                 13.4 8.4 3.8
Operating costs and expenses                 37.7 63.2 0.2
Total expenses                 142.9 134.3 66.5
Income before income taxes                 (104.8) (117.2) (54.3)
Income tax benefit                 (25.7) (32.2) (18.3)
Loss before equity in undistributed earnings of subsidiaries                 (79.1) (85.0) (36.0)
Equity in undistributed earnings of subsidiaries                 483.1 361.5 666.6
Net income                 $ 404.0 $ 276.5 $ 630.6