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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 167.3 $ 175.9 $ 240.2 $ 592.6
Other comprehensive income (loss), before tax:        
Unrealized losses on investments (922.4) (1,407.2) (569.1) (6,128.2)
Adjustment to discount rate for liability for future policy benefits 627.0 862.6 520.9 3,241.4
Adjustment to instrument-specific credit risk for market risk benefits (3.0) 0.3 (4.4) 11.0
Reclassification adjustments:        
For net realized investment losses included in net income 12.0 1.0 52.1 36.0
Other comprehensive loss before tax (286.4) (543.3) (0.5) (2,839.8)
Income tax benefit related to items of accumulated other comprehensive loss 63.2 121.3 1.1 628.3
Other comprehensive income (loss), net of tax (223.2) (422.0) 0.6 (2,211.5)
Comprehensive income (loss) $ (55.9) $ (246.1) $ 240.8 $ (1,618.9)