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Future Policy Benefits and Claims - Benefits and Protection (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Present value of expected future policy benefit payments        
Future policy benefits $ 39,003.2   $ 39,003.2 $ 36,831.4
Benefits and Protection        
Present value of expected future policy benefit payments        
Future policy benefits 3,492.0   3,492.0 3,077.0
Benefits and Protection | Life Insurance | Term life        
Present value of expected net premiums        
Balance at beginning of period, Present value of expected net premiums     4,107.2 3,793.7
Effect of changes in discount rate assumptions at beginning of period     290.1 100.1
Balance at beginning of period at original discount rate     4,397.3 3,893.8
Effect of changes in cash flow assumptions 163.2   163.2 419.9
Effect of actual variances from expected experience 8.5   8.5 42.5
Adjusted beginning of period balance at original discount rate 4,569.0   4,569.0 4,356.2
Interest accrual     155.2 190.9
Net premiums collected     (313.7) (390.8)
Issuances     169.9 241.0
Balance at end of period at original discount rate 4,580.4   4,580.4 4,397.3
Effect of changes in discount rate assumptions at end of period (175.4)   (175.4) (290.1)
Balance at end of period, Present value of expected net premiums 4,405.0   4,405.0 4,107.2
Present value of expected future policy benefit payments        
Balance at beginning of period, Present value of expected future policy benefit payments     5,355.2 4,879.6
Effect of changes in discount rate assumptions at beginning of period     366.0 124.5
Balance at beginning of period at original discount rate     5,721.2 5,004.1
Effect of changes in cash flow assumptions 240.4   240.4 488.1
Effect of actual variances from expected experience 2.3   2.3 45.1
Adjusted beginning of period balance at original discount rate 5,963.9   5,963.9 5,537.3
Interest accrual     204.1 247.9
Benefit payments     (265.1) (321.6)
Issuances     180.2 257.6
Balance at end of period at original discount rate 6,083.1   6,083.1 5,721.2
Effect of changes in discount rate assumptions at end of period (193.6)   (193.6) (366.0)
Balance at end of period, Present value of expected future policy benefit payments 5,889.5   5,889.5 5,355.2
Future policy benefits 1,484.5   1,484.5 1,248.0
Reinsurance impact 18.3   18.3 19.5
Future policy benefits after reinsurance 1,502.8   $ 1,502.8 $ 1,267.5
Increase (decrease) in LFPB from actuarial assumptions 77.2 $ 68.2    
Income before taxes, net of reinsurance increase (decrease) from actuarial assumptions $ (63.0) (52.9)    
Weighted-average duration for future policy benefits (in years) 7 years 7 months 6 days   7 years 7 months 6 days 8 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     $ 2,680.6 $ 2,552.3
Effect of changes in discount rate assumptions at beginning of period     436.4 313.7
Balance at beginning of period at original discount rate     3,117.0 2,866.0
Effect of changes in cash flow assumptions $ (22.5)   (22.5) 183.9
Effect of actual variances from expected experience 97.5   97.5 168.3
Adjusted beginning of period balance at original discount rate 3,192.0   3,192.0 3,218.2
Interest accrual     81.5 103.5
Net premiums collected     (224.6) (289.1)
Issuances     54.4 84.4
Balance at end of period at original discount rate 3,103.3   3,103.3 3,117.0
Effect of changes in discount rate assumptions at end of period (345.2)   (345.2) (436.4)
Balance at end of period, Present value of expected net premiums 2,758.1   2,758.1 2,680.6
Present value of expected future policy benefit payments        
Balance at beginning of period, Present value of expected future policy benefit payments     4,509.6 4,450.7
Effect of changes in discount rate assumptions at beginning of period     1,302.8 903.5
Balance at beginning of period at original discount rate     5,812.4 5,354.2
Effect of changes in cash flow assumptions (42.6)   (42.6) 216.2
Effect of actual variances from expected experience 96.5   96.5 173.2
Adjusted beginning of period balance at original discount rate 5,866.3   5,866.3 5,743.6
Interest accrual     159.9 203.3
Benefit payments     (169.0) (219.0)
Issuances     53.2 84.5
Balance at end of period at original discount rate 5,910.4   5,910.4 5,812.4
Effect of changes in discount rate assumptions at end of period (1,144.8)   (1,144.8) (1,302.8)
Balance at end of period, Present value of expected future policy benefit payments 4,765.6   4,765.6 4,509.6
Future policy benefits 2,007.5   2,007.5 1,829.0
Reinsurance impact (440.2)   (440.2) (412.1)
Future policy benefits after reinsurance 1,567.3   $ 1,567.3 $ 1,416.9
Increase (decrease) in LFPB from actuarial assumptions (20.1) 32.3    
Income before taxes, net of reinsurance increase (decrease) from actuarial assumptions $ 16.2 $ (18.2)    
Weighted-average duration for future policy benefits (in years) 17 years 6 months   17 years 6 months 18 years 3 months 18 days