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Future Policy Benefits and Claims - Benefits and Protection (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2022
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
Benefits and Protection          
Present value of expected future policy benefit payments          
Future policy benefits   2,767.4 2,607.8   3,661.2
Benefits and Protection | Life Insurance | Term life          
Present value of expected net premiums          
Balance at beginning of period, Present value of expected net premiums   3,423.2 4,193.7    
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 actual variances from expected experience   55.2 128.6 211.4  
Adjusted beginning of period balance at original discount rate   3,674.4 3,632.2 3,149.3  
Interest accrual   83.3 162.9 151.1  
Net premiums collected   (172.9) (346.6) (315.0)  
Issuances   103.8 170.7 518.2  
Balance at end of period at original discount rate   3,688.6 3,619.2 3,503.6  
Effect of changes in discount rate assumptions at end of period   (168.1) (196.0) 690.1  
Balance at end of period, Present value of expected net premiums   3,520.5 3,423.2 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 actual variances from expected experience   61.0 139.0 216.0  
Adjusted beginning of period balance at original discount rate   4,644.8 4,536.4 3,995.4  
Interest accrual   106.4 206.8 194.3  
Benefit payments   (166.1) (340.6) (335.7)  
Issuances   111.5 181.2 543.4  
Balance at end of period at original discount rate   4,696.6 4,583.8 4,397.4  
Effect of changes in discount rate assumptions at end of period   (213.9) (251.6) 913.9  
Balance at end of period, Present value of expected future policy benefit payments   4,482.7 4,332.2 5,311.3  
Future policy benefits   962.2 909.0 1,117.6 1,160.3
Reinsurance Impact   44.8 25.6 (0.1)  
Future policy benefits after reinsurance   1,007.0 934.6 1,117.5  
Liability for future policy benefit increase (decrease) due to effect of changes in discount rate assumptions   $ 9.8 $ (279.4)    
Weighted-average duration for future policy benefits (in years)   9 years 2 months 12 days 9 years 7 months 6 days    
Benefits and Protection | Specialty Benefits | Individual disability          
Present value of expected net premiums          
Balance at beginning of period, Present value of expected net premiums   $ 2,341.8 $ 3,149.9    
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     (413.1)    
Effect of actual variances from expected experience   131.8 235.9 122.0  
Adjusted beginning of period balance at original discount rate   2,868.8 2,773.8 2,929.6  
Interest accrual   47.4 95.2 95.4  
Net premiums collected   (134.3) (276.5) (280.4)  
Issuances   49.0 144.5 206.4  
Balance at end of period at original discount rate   2,830.9 2,737.0 2,951.0  
Effect of changes in discount rate assumptions at end of period   (361.1) (395.2) 198.9  
Balance at end of period, Present value of expected net premiums   2,469.8 2,341.8 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     (476.3)    
Effect of actual variances from expected experience   141.6 240.0 118.8  
Adjusted beginning of period balance at original discount rate   5,203.6 4,911.0 4,933.9  
Interest accrual   94.1 185.4 181.0  
Benefit payments   (94.7) (183.7) (179.7)  
Issuances   50.6 149.3 212.1  
Balance at end of period at original discount rate   5,253.6 5,062.0 5,147.3  
Effect of changes in discount rate assumptions at end of period   (978.6) (1,021.4) 501.0  
Balance at end of period, Present value of expected future policy benefit payments   4,275.0 4,040.6 5,648.3  
Future policy benefits   1,805.2 1,698.8 2,498.4 $ 2,500.9
Reinsurance Impact   (408.9) (386.8) (549.9)  
Future policy benefits after reinsurance   1,396.3 1,312.0 $ 1,948.5  
Liability for future policy benefit increase (decrease) due to effect of changes in discount rate assumptions   $ 8.7 $ (928.3)    
Liability for future policy benefits increase (decrease) from actuarial assumptions $ (63.2)        
Pre-tax operating earnings, net of reinsurance, increase (decrease) from actuarial assumptions $ 52.4        
Weighted-average duration for future policy benefits (in years)   18 years 6 months 18 years 6 months