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Reconciliation of Total Revenue and Income Before Income Tax to Operating Revenue and Operating Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated        
Total Revenue $ 3,378.4 $ 3,217.0 $ 9,831.4 $ 9,650.7
Net Investment Loss 128.0 (12.9) (96.5) (24.5)
Amortization of Deferred Gain on Reinsurance 4.6 0.0 4.6 0.0
Income Before Income Tax 54.5 814.6 715.1 1,805.8
Amortization of the Cost of Reinsurance (48.6) (10.4) (67.9) (31.1)
Reserve Assumption Updates (478.5) 357.4 (478.5) 357.4
Litigation Settlement, Loss 0.0 15.3 0.0 15.3
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated        
Total Revenue 3,378.4 3,217.0 9,831.4 9,650.7
Net Investment Loss 128.0 (12.9) (96.5) (24.5)
Adjusted Operating Revenue 3,245.8 3,229.9 9,923.3 9,675.2
Income Before Income Tax 54.5 814.6 715.1 1,805.8
Non-Contemporaneous Reinsurance (7.7) (6.0) (19.5) (20.2)
Adjusted Operating Income 456.7 501.8 1,372.9 1,539.5
Long-term Care and Individual Disability Reinsurance Transaction | Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated        
Net Investment Loss 137.6 0.0 (46.8) 0.0
Unrelated to Significant Transaction | Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated        
Net Investment Loss $ (9.6) $ (12.9) $ (49.7) $ (24.5)