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Future Policy Benefits and Claims - Corporate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Present value of expected future policy benefit payments    
Future policy benefits $ 36,831.4 $ 36,514.6
Corporate | Long-term care insurance    
Present value of expected net premiums    
Balance at beginning of period, Present value of expected net premiums 42.8 64.6
Effect of changes in discount rate assumptions at beginning of period (3.0) (3.6)
Balance at beginning of period at original discount rate 39.8 61.0
Effect of changes in cash flow assumptions (5.3) (13.3)
Effect of actual variances from expected experience (2.2) (5.7)
Adjusted beginning of period balance at original discount rate 32.3 42.0
Interest accrual 1.9 2.9
Net premiums collected (4.7) (5.1)
Balance at end of period at original discount rate 29.5 39.8
Effect of changes in discount rate assumptions at end of period 1.3 3.0
Balance at end of period, Present value of expected net premiums 30.8 42.8
Present value of expected future policy benefit payments    
Balance at beginning of period, Present value of expected future policy benefit payments 209.5 248.1
Effect of changes in discount rate assumptions at beginning of period (20.0) (18.9)
Balance at beginning of period at original discount rate 189.5 229.2
Effect of changes in cash flow assumptions (1.2) (40.5)
Effect of actual variances from expected experience 2.5 2.5
Adjusted beginning of period balance at original discount rate 190.8 191.2
Interest accrual 11.2 12.5
Benefit payments (15.2) (14.2)
Balance at end of period at original discount rate 186.8 189.5
Effect of changes in discount rate assumptions at end of period 8.8 20.0
Balance at end of period, Present value of expected future policy benefit payments 195.6 209.5
Future policy benefits 164.8 166.7
Reinsurance impact $ (164.8) $ (166.7)
Weighted-average duration for future policy benefits (in years) 9 years 3 months 18 days 10 years 4 months 24 days