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Future Policy Benefits and Claims - Corporate (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Present value of expected future policy benefit payments    
Future policy benefits $ 37,920.5 $ 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   (5.3)
Effect of actual variances from expected experience 0.4 (2.2)
Adjusted beginning of period balance at original discount rate 29.9 32.3
Interest accrual 0.4 1.9
Net premiums collected (1.4) (4.7)
Balance at end of period at original discount rate 28.9 29.5
Effect of changes in discount rate assumptions at end of period 1.7 1.3
Balance at end of period, Present value of expected net premiums 30.6 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   (1.2)
Effect of actual variances from expected experience 1.1 2.5
Adjusted beginning of period balance at original discount rate 187.9 190.8
Interest accrual 2.8 11.2
Benefit payments (3.9) (15.2)
Balance at end of period at original discount rate 186.8 186.8
Effect of changes in discount rate assumptions at end of period 10.8 8.8
Balance at end of period, Present value of expected future policy benefit payments 197.6 195.6
Future policy benefits 167.0 164.8
Reinsurance impact $ (167.0) $ (164.8)
Weighted-average duration for future policy benefits (in years) 9 years 2 months 12 days 9 years 3 months 18 days