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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net income $ 404.0 $ 276.5 $ 630.6
Other comprehensive income (loss), before tax:      
Unrealized gains (losses) on investments (294.4) 823.6 (6,028.4)
Adjustment to discount rate for liability for future policy benefits 491.1 (367.3) 2,971.6
Adjustment to instrument-specific credit risk for market risk benefits (3.4) (7.4) 0.1
Reclassification adjustments:      
For net realized investment losses included in net income 70.3 37.9 60.5
Other comprehensive income (loss) before tax 263.6 486.8 (2,996.2)
Income tax (expense) benefit related to items of accumulated other comprehensive income (loss) (58.2) (106.3) 665.2
Other comprehensive income (loss), net of tax 205.4 380.5 (2,331.0)
Comprehensive income (loss) $ 609.4 $ 657.0 $ (1,700.4)