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Nature of Operations and Significant Accounting Policies - Balances and changes in LFPB for Benefits and Protection and 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
Benefits and Protection        
Present value of expected future policy benefit payments        
Future policy benefits 2,984.3 2,607.8   3,661.2
Benefits and Protection | Specialty Benefits | Individual disability        
Present value of expected net premiums        
Balance at beginning of period, Present value of expected net premiums   3,149.9 $ 3,148.3  
Effect of changes in discount rate assumptions at beginning of period 395.2 (198.9) 340.7  
Balance at beginning of period at original discount rate 2,737.0 2,951.0 2,807.6  
Effect of changes in cash flow assumptions (37.6) (413.1)    
Effect of actual variances from expected experience 244.3 235.9 122.0  
Adjusted beginning of period balance at original discount rate 2,943.7 2,773.8 (2,929.6)  
Interest accrual 95.6 95.2 95.4  
Net premiums collected (273.4) (276.5) (280.4)  
Issuances 100.1 144.5 206.4  
Balance at end of period at original discount rate 2,866.0 2,737.0 2,951.0  
Effect of changes in discount rate assumptions at end of period (313.7) (395.2) 198.9  
Balance at end of period, Present value of expected net premiums     3,149.9  
Present value of expected future policy benefit payments        
Balance at beginning of period, Present value of expected future policy benefit payments 4,040.6 5,648.3 5,649.2  
Effect of changes in discount rate assumptions at beginning of period 1,021.4 (501.0) (834.1)  
Balance at beginning of period at original discount rate 5,062.0 5,147.3 4,815.1  
Effect of changes in cash flow assumptions (51.5) (476.3)    
Effect of actual variances from expected experience 260.8 240.0 118.8  
Adjusted beginning of period balance at original discount rate 5,271.3 4,911.0 4,933.9  
Interest accrual 190.1 185.4 181.0  
Benefit payments (210.0) (183.7) (179.7)  
Issuances 102.8 149.3 212.1  
Balance at end of period at original discount rate 5,354.2 5,062.0 5,147.3  
Effect of changes in discount rate assumptions at end of period (903.5) (1,021.4) 501.0  
Balance at end of period, Present value of expected future policy benefit payments 4,450.7 4,040.6 5,648.3  
Future policy benefits 1,898.4 1,698.8 2,498.4 2,500.9
Reinsurance Impact (421.6) (386.8) (549.9)  
Future policy benefits after reinsurance 1,476.8 1,312.0 1,948.5  
Benefits and Protection | Life Insurance | Term life        
Present value of expected net premiums        
Balance at beginning of period, Present value of expected net premiums   4,193.7 3,799.0  
Effect of changes in discount rate assumptions at beginning of period 196.0 (690.1) 861.1  
Balance at beginning of period at original discount rate 3,619.2 3,503.6 2,937.9  
Effect of changes in cash flow assumptions 143.5      
Effect of actual variances from expected experience 103.3 128.6 211.4  
Adjusted beginning of period balance at original discount rate 3,866.0 3,632.2 (3,149.3)  
Interest accrual 171.9 162.9 151.1  
Net premiums collected (359.8) (346.6) (315.0)  
Issuances 215.7 170.7 518.2  
Balance at end of period at original discount rate 3,893.8 3,619.2 3,503.6  
Effect of changes in discount rate assumptions at end of period (100.1) (196.0) 690.1  
Balance at end of period, Present value of expected net premiums     4,193.7  
Present value of expected future policy benefit payments        
Balance at beginning of period, Present value of expected future policy benefit payments 4,332.2 5,311.3 4,959.3  
Effect of changes in discount rate assumptions at beginning of period 251.6 (913.9) (1,179.9)  
Balance at beginning of period at original discount rate 4,583.8 4,397.4 3,779.4  
Effect of changes in cash flow assumptions 181.8      
Effect of actual variances from expected experience 116.8 139.0 216.0  
Adjusted beginning of period balance at original discount rate 4,882.4 4,536.4 3,995.4  
Interest accrual 220.1 206.8 194.3  
Benefit payments (330.4) (340.6) (335.7)  
Issuances 232.0 181.2 543.4  
Balance at end of period at original discount rate 5,004.1 4,583.8 4,397.4  
Effect of changes in discount rate assumptions at end of period (124.5) (251.6) 913.9  
Balance at end of period, Present value of expected future policy benefit payments 4,879.6 4,332.2 5,311.3  
Future policy benefits 1,085.9 909.0 1,117.6 1,160.3
Reinsurance Impact 45.2 25.6 (0.1)  
Future policy benefits after reinsurance 1,131.1 934.6 1,117.5  
Corporate | Long-term care insurance        
Present value of expected net premiums        
Balance at beginning of period, Present value of expected net premiums   62.8 66.7  
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     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)