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Future Policy Benefits and Claims - Liability for Unpaid Claims (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Change in unpaid claims    
Balance at beginning of period, unpaid claims $ 1,379.9 $ 1,405.9
Balance at beginning of period, reinsurance recoverables for unpaid claims 61.2 67.8
Net balance at beginning of period, unpaid claims 1,318.7 1,338.1
Incurred:    
Incurred: Current year 472.5 458.0
Incurred: Prior years (42.4) (47.4)
Total incurred 430.1 410.6
Payments:    
Payments: Current year 256.1 240.3
Payments: Prior years 175.0 173.0
Total payments 431.1 413.3
Net balance at end of period, unpaid claims 1,317.7 1,335.4
Balance at end of period, reinsurance recoverables for unpaid claims 61.0 64.5
Balance at end of period, unpaid claims $ 1,378.7 $ 1,399.9