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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, 2023
Jun. 30, 2024
Dec. 31, 2023
Present value of expected future policy benefit payments      
Future policy benefits   $ 36,087.4 $ 36,514.6
Benefits and Protection      
Present value of expected future policy benefit payments      
Future policy benefits   2,915.5 2,984.3
Benefits and Protection | Life Insurance | Term life      
Present value of expected net premiums      
Balance at beginning of period, Present value of expected net premiums   3,793.7 3,423.2
Effect of changes in discount rate assumptions at beginning of period   100.1 196.0
Balance at beginning of period at original discount rate   3,893.8 3,619.2
Effect of changes in cash flow assumptions     143.5
Effect of actual variances from expected experience   44.5 103.3
Adjusted beginning of period balance at original discount rate   3,938.3 3,866.0
Interest accrual   90.0 171.9
Net premiums collected   (190.2) (359.8)
Issuances   121.9 215.7
Balance at end of period at original discount rate   3,960.0 3,893.8
Effect of changes in discount rate assumptions at end of period   (246.9) (100.1)
Balance at end of period, Present value of expected net premiums   3,713.1 3,793.7
Present value of expected future policy benefit payments      
Balance at beginning of period, Present value of expected future policy benefit payments   4,879.6 4,332.2
Effect of changes in discount rate assumptions at beginning of period   124.5 251.6
Balance at beginning of period at original discount rate   5,004.1 4,583.8
Effect of changes in cash flow assumptions     181.8
Effect of actual variances from expected experience   50.2 116.8
Adjusted beginning of period balance at original discount rate   5,054.3 4,882.4
Interest accrual   116.8 220.1
Benefit payments   (169.6) (330.4)
Issuances   130.9 232.0
Balance at end of period at original discount rate   5,132.4 5,004.1
Effect of changes in discount rate assumptions at end of period   (315.9) (124.5)
Balance at end of period, Present value of expected future policy benefit payments   4,816.5 4,879.6
Future policy benefits   1,103.4 1,085.9
Reinsurance Impact   43.3 45.2
Future policy benefits after reinsurance   1,146.7 1,131.1
Increase (decrease) to LFPB due to effect of changes in discount rate assumptions   $ (44.6) $ 31.2
Increase (decrease) in LFPB from actuarial assumptions $ 38.3    
Income before taxes, net of reinsurance increase (decrease) from actuarial assumptions (25.4)    
Weighted-average duration for future policy benefits (in years)   8 years 10 months 24 days 9 years 4 months 24 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   $ 2,552.3 $ 2,341.8
Effect of changes in discount rate assumptions at beginning of period   313.7 395.2
Balance at beginning of period at original discount rate   2,866.0 2,737.0
Effect of changes in cash flow assumptions     (37.6)
Effect of actual variances from expected experience   81.7 244.3
Adjusted beginning of period balance at original discount rate   2,947.7 2,943.7
Interest accrual   49.6 95.6
Net premiums collected   (139.4) (273.4)
Issuances   39.5 100.1
Balance at end of period at original discount rate   2,897.4 2,866.0
Effect of changes in discount rate assumptions at end of period   (399.9) (313.7)
Balance at end of period, Present value of expected net premiums   2,497.5 2,552.3
Present value of expected future policy benefit payments      
Balance at beginning of period, Present value of expected future policy benefit payments   4,450.7 4,040.6
Effect of changes in discount rate assumptions at beginning of period   903.5 1,021.4
Balance at beginning of period at original discount rate   5,354.2 5,062.0
Effect of changes in cash flow assumptions     (51.5)
Effect of actual variances from expected experience   88.6 260.8
Adjusted beginning of period balance at original discount rate   5,442.8 5,271.3
Interest accrual   98.6 190.1
Benefit payments   (106.3) (210.0)
Issuances   40.4 102.8
Balance at end of period at original discount rate   5,475.5 5,354.2
Effect of changes in discount rate assumptions at end of period   (1,165.9) (903.5)
Balance at end of period, Present value of expected future policy benefit payments   4,309.6 4,450.7
Future policy benefits   1,812.1 1,898.4
Reinsurance Impact   (403.9) (421.6)
Future policy benefits after reinsurance   1,408.2 1,476.8
Increase (decrease) to LFPB due to effect of changes in discount rate assumptions   $ (176.2) $ 36.4
Increase (decrease) in LFPB from actuarial assumptions (13.9)    
Income before taxes, net of reinsurance increase (decrease) from actuarial assumptions $ 10.2    
Weighted-average duration for future policy benefits (in years)   17 years 9 months 18 days 18 years 4 months 24 days