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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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 $ 39.7 $ 645.7 $ 564.4 $ 1,430.4
Other Comprehensive Income (Loss)        
Change in Net Unrealized Loss on Securities (net of tax expense of $71.7; $327.6; $203.9; $110.4) 275.5 1,232.6 777.0 427.9
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance (net of tax expense (benefit) of $(106.0); $(329.3); $(137.7); $35.6) (402.3) (1,239.3) (528.8) 121.4
Change in Net Loss on Derivatives (net of tax expense (benefit) of $5.9; $14.1; $1.7; $(9.0)) 20.8 55.7 6.5 (35.2)
Change in Foreign Currency Translation Adjustment (net of tax expense (benefit) of $(0.1); $—; $0.1; $1.5) (25.4) 68.5 96.9 61.2
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $1.4; $(0.3); $0.7; $9.8) (4.8) 1.0 (4.8) (3.0)
Net Other Comprehensive Income (126.6) 116.5 356.4 578.3
Comprehensive Income $ (86.9) $ 762.2 $ 920.8 $ 2,008.7