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Future Policy Benefits and Claims - Benefits and Protection (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Present value of expected future policy benefit payments        
Future policy benefits     $ 36,831.4 $ 36,514.6
Benefits and Protection        
Present value of expected future policy benefit payments        
Future policy benefits     3,077.0 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     419.9 143.5
Effect of actual variances from expected experience     42.5 103.3
Adjusted beginning of period balance at original discount rate     4,356.2 3,866.0
Interest accrual     190.9 171.9
Net premiums collected     (390.8) (359.8)
Issuances     241.0 215.7
Balance at end of period at original discount rate     4,397.3 3,893.8
Effect of changes in discount rate assumptions at end of period     (290.1) (100.1)
Balance at end of period, Present value of expected net premiums     4,107.2 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     488.1 181.8
Effect of actual variances from expected experience     45.1 116.8
Adjusted beginning of period balance at original discount rate     5,537.3 4,882.4
Interest accrual     247.9 220.1
Benefit payments     (321.6) (330.4)
Issuances     257.6 232.0
Balance at end of period at original discount rate     5,721.2 5,004.1
Effect of changes in discount rate assumptions at end of period     (366.0) (124.5)
Balance at end of period, Present value of expected future policy benefit payments     5,355.2 4,879.6
Future policy benefits     1,248.0 1,085.9
Reinsurance impact     19.5 45.2
Future policy benefits after reinsurance     $ 1,267.5 $ 1,131.1
Increase (decrease) in LFPB from actuarial assumptions $ 68.2 $ 38.3    
Income before taxes, net of reinsurance increase (decrease) from actuarial assumptions (52.9) (25.4)    
Weighted-average duration for future policy benefits (in years)     8 years 4 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     183.9 (37.6)
Effect of actual variances from expected experience     168.3 244.3
Adjusted beginning of period balance at original discount rate     3,218.2 2,943.7
Interest accrual     103.5 95.6
Net premiums collected     (289.1) (273.4)
Issuances     84.4 100.1
Balance at end of period at original discount rate     3,117.0 2,866.0
Effect of changes in discount rate assumptions at end of period     (436.4) (313.7)
Balance at end of period, Present value of expected net premiums     2,680.6 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     216.2 (51.5)
Effect of actual variances from expected experience     173.2 260.8
Adjusted beginning of period balance at original discount rate     5,743.6 5,271.3
Interest accrual     203.3 190.1
Benefit payments     (219.0) (210.0)
Issuances     84.5 102.8
Balance at end of period at original discount rate     5,812.4 5,354.2
Effect of changes in discount rate assumptions at end of period     (1,302.8) (903.5)
Balance at end of period, Present value of expected future policy benefit payments     4,509.6 4,450.7
Future policy benefits     1,829.0 1,898.4
Reinsurance impact     (412.1) (421.6)
Future policy benefits after reinsurance     $ 1,416.9 $ 1,476.8
Increase (decrease) in LFPB from actuarial assumptions 32.3 (13.9)    
Income before taxes, net of reinsurance increase (decrease) from actuarial assumptions $ (18.2) $ 10.2    
Weighted-average duration for future policy benefits (in years)     18 years 3 months 18 days 18 years 4 months 24 days