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Future Policy Benefits and Claims - Corporate (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Present value of expected future policy benefit payments    
Future policy benefits $ 39,003.2 $ 36,831.4
Corporate | Long-term care insurance    
Present value of expected net premiums    
Balance at beginning of period, Present value of expected net premiums 30.8 42.8
Effect of changes in discount rate assumptions at beginning of period (1.3) (3.0)
Balance at beginning of period at original discount rate 29.5 39.8
Effect of changes in cash flow assumptions 3.3 (5.3)
Effect of actual variances from expected experience (0.1) (2.2)
Adjusted beginning of period balance at original discount rate 32.7 32.3
Interest accrual 1.3 1.9
Net premiums collected (3.5) (4.7)
Balance at end of period at original discount rate 30.5 29.5
Effect of changes in discount rate assumptions at end of period 2.1 1.3
Balance at end of period, Present value of expected net premiums 32.6 30.8
Present value of expected future policy benefit payments    
Balance at beginning of period, Present value of expected future policy benefit payments 195.6 209.5
Effect of changes in discount rate assumptions at beginning of period (8.8) (20.0)
Balance at beginning of period at original discount rate 186.8 189.5
Effect of changes in cash flow assumptions 1.3 (1.2)
Effect of actual variances from expected experience 2.0 2.5
Adjusted beginning of period balance at original discount rate 190.1 190.8
Interest accrual 8.4 11.2
Benefit payments (12.1) (15.2)
Balance at end of period at original discount rate 186.4 186.8
Effect of changes in discount rate assumptions at end of period 14.3 8.8
Balance at end of period, Present value of expected future policy benefit payments 200.7 195.6
Future policy benefits 168.1 164.8
Reinsurance impact $ (168.1) $ (164.8)
Weighted-average duration for future policy benefits (in years) 9 years 10 months 24 days 9 years 3 months 18 days