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Reserves - Roll Forward of Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Claims and benefits payable, at beginning of period $ 2,101.2 $ 2,914.2
Less: Reinsurance ceded and other (899.0) (1,669.8)
Net claims and benefits payable, at beginning of period 1,202.2 1,244.4
Incurred losses and loss adjustment expenses related to:    
Current year 801.3 841.0
Prior years (32.2) (61.3)
Total incurred losses and loss adjustment expenses 769.1 779.7
Paid losses and loss adjustment expenses related to:    
Current year 309.9 350.2
Prior years 394.3 389.7
Total paid losses and loss adjustment expenses 704.2 739.9
Net claims and benefits payable, at end of period 1,267.1 1,284.2
Plus: Reinsurance ceded and other 901.5 1,285.9
Claims and benefits payable, at end of period 2,168.6 2,570.1
Ceded to U.S. Government | Not Rated    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Reinsurance recoverables $ 183.4 $ 492.4