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Future Policy Benefits and Claims - Corporate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Present value of expected future policy benefit payments        
Future policy benefits $ 36,514.6 $ 34,064.4   $ 43,489.8
Corporate | Long-term care insurance        
Present value of expected net premiums        
Balance at beginning of period, Present value of expected net premiums 64.6 62.8    
Effect of changes in discount rate assumptions at beginning of period (3.6) (14.0) $ 17.6  
Balance at beginning of period at original discount rate 61.0 48.8 49.1  
Effect of changes in cash flow assumptions (13.3) 10.0 2.8  
Effect of actual variances from expected experience (5.7) 4.1 (0.8)  
Adjusted beginning of period balance at original discount rate 42.0 62.9 (51.1)  
Interest accrual 2.9 3.3 2.9  
Net premiums collected (5.1) (5.2) (5.2)  
Balance at end of period at original discount rate 39.8 61.0 48.8  
Effect of changes in discount rate assumptions at end of period 3.0 3.6 14.0  
Balance at end of period, Present value of expected net premiums 42.8 64.6 62.8  
Present value of expected future policy benefit payments        
Balance at beginning of period, Present value of expected future policy benefit payments 248.1 297.5 324.3  
Effect of changes in discount rate assumptions at beginning of period (18.9) (89.5) (111.1)  
Balance at beginning of period at original discount rate 229.2 208.0 213.2  
Effect of changes in cash flow assumptions (40.5) 17.2 0.5  
Effect of actual variances from expected experience 2.5 3.7 (4.6)  
Adjusted beginning of period balance at original discount rate 191.2 228.9 209.1  
Interest accrual 12.5 13.1 12.4  
Benefit payments (14.2) (12.8) (13.5)  
Balance at end of period at original discount rate 189.5 229.2 208.0  
Effect of changes in discount rate assumptions at end of period 20.0 18.9 89.5  
Balance at end of period, Present value of expected future policy benefit payments 209.5 248.1 297.5  
Future policy benefits 166.7 183.5 234.7 $ 257.6
Reinsurance Impact $ (166.7) $ (183.5) $ (234.7)  
Weighted-average duration for future policy benefits (in years) 10 years 4 months 24 days 11 years 9 months 18 days    
Increase (decrease) to LFPB due to effect of changes in discount rate assumptions $ 1.7 $ (60.2)