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Future Policy Benefits and Claims - Corporate (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Present value of expected future policy benefit payments        
Future policy benefits $ 35,230.6 $ 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   10.0 2.8  
Effect of actual variances from expected experience (5.9) 4.1 (0.8)  
Adjusted beginning of period balance at original discount rate 55.1 62.9 51.1  
Interest accrual 1.7 3.3 2.9  
Net premiums collected (2.7) (5.2) (5.2)  
Balance at end of period at original discount rate 54.1 61.0 48.8  
Effect of changes in discount rate assumptions at end of period 3.3 3.6 14.0  
Balance at end of period, Present value of expected net premiums 57.4 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   17.2 0.5  
Effect of actual variances from expected experience 1.2 3.7 (4.6)  
Adjusted beginning of period balance at original discount rate 230.4 228.9 209.1  
Interest accrual 6.8 13.1 12.4  
Benefit payments (6.9) (12.8) (13.5)  
Balance at end of period at original discount rate 230.3 229.2 208.0  
Effect of changes in discount rate assumptions at end of period 21.6 18.9 89.5  
Balance at end of period, Present value of expected future policy benefit payments 251.9 248.1 297.5  
Future policy benefits 194.5 183.5 234.7 $ 257.6
Reinsurance Impact $ (194.5) $ (183.5) $ (234.7)  
Weighted-average duration for future policy benefits (in years) 11 years 6 months 11 years 9 months 18 days    
Liability for future policy benefit increase (decrease) due to effect of changes in discount rate assumptions $ 3.0 $ (60.2)