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Future Policy Benefits and Claims - Benefits and Protection (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Dec. 31, 2024
Present value of expected future policy benefit payments      
Future policy benefits $ 37,920.5   $ 36,831.4
Benefits and Protection      
Present value of expected future policy benefit payments      
Future policy benefits 3,190.1   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     419.9
Effect of actual variances from expected experience 2.4   42.5
Adjusted beginning of period balance at original discount rate 4,399.7   4,356.2
Interest accrual 50.9   190.9
Net premiums collected (100.9)   (390.8)
Issuances 53.2   241.0
Balance at end of period at original discount rate 4,402.9   4,397.3
Effect of changes in discount rate assumptions at end of period (239.1)   (290.1)
Balance at end of period, Present value of expected net premiums 4,163.8   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     488.1
Effect of actual variances from expected experience 0.2   45.1
Adjusted beginning of period balance at original discount rate 5,721.4   5,537.3
Interest accrual 66.4   247.9
Benefit payments (89.2)   (321.6)
Issuances 56.4   257.6
Balance at end of period at original discount rate 5,755.0   5,721.2
Effect of changes in discount rate assumptions at end of period (292.1)   (366.0)
Balance at end of period, Present value of expected future policy benefit payments 5,462.9   5,355.2
Future policy benefits 1,299.1   1,248.0
Reinsurance impact 24.6   19.5
Future policy benefits after reinsurance $ 1,323.7   $ 1,267.5
Increase (decrease) in LFPB from actuarial assumptions   $ 68.2  
Income before taxes, net of reinsurance increase (decrease) from actuarial assumptions   (52.9)  
Weighted-average duration for future policy benefits (in years) 8 years 3 months 18 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     183.9
Effect of actual variances from expected experience 28.7   168.3
Adjusted beginning of period balance at original discount rate 3,145.7   3,218.2
Interest accrual 27.1   103.5
Net premiums collected (72.8)   (289.1)
Issuances 18.4   84.4
Balance at end of period at original discount rate 3,118.4   3,117.0
Effect of changes in discount rate assumptions at end of period (400.5)   (436.4)
Balance at end of period, Present value of expected net premiums 2,717.9   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     216.2
Effect of actual variances from expected experience 29.5   173.2
Adjusted beginning of period balance at original discount rate 5,841.9   5,743.6
Interest accrual 52.9   203.3
Benefit payments (57.0)   (219.0)
Issuances 18.1   84.5
Balance at end of period at original discount rate 5,855.9   5,812.4
Effect of changes in discount rate assumptions at end of period (1,247.0)   (1,302.8)
Balance at end of period, Present value of expected future policy benefit payments 4,608.9   4,509.6
Future policy benefits 1,891.0   1,829.0
Reinsurance impact (423.5)   (412.1)
Future policy benefits after reinsurance $ 1,467.5   $ 1,416.9
Increase (decrease) in LFPB from actuarial assumptions   32.3  
Income before taxes, net of reinsurance increase (decrease) from actuarial assumptions   $ (18.2)  
Weighted-average duration for future policy benefits (in years) 18 years   18 years 3 months 18 days