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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 23.1 $ 9.3 $ 136.4 $ 237.9
Other comprehensive income (loss), before tax:        
Unrealized gains on investments 350.0 948.5 568.0 616.8
Adjustment to discount rate for liability for future policy benefits (188.7) (508.5) (283.8) (70.0)
Adjustment to instrument-specific credit risk for market risk benefits (1.2) (2.1) (0.6) (2.7)
Reclassification adjustments:        
For net realized investment losses included in net income 11.1 9.6 38.8 46.6
Other comprehensive income before tax 171.2 447.5 322.4 590.7
Income tax expense related to items of accumulated other comprehensive income (37.4) (99.2) (69.9) (129.9)
Other comprehensive income, net of tax 133.8 348.3 252.5 460.8
Comprehensive income $ 156.9 $ 357.6 $ 388.9 $ 698.7