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Losses, Claims and Settlement Expenses (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments     $ 5,807.1 $ 4,977.7
Liability for Unpaid Claims and Claims Adjustment Expense        
Gross reserves at beginning of period $ 13,727.7 $ 12,538.2    
Less: Reinsurance losses recoverable 6,236.0 5,256.7    
Net reserves at beginning of period     7,920.6 7,560.4
Provisions for insured events of the current year 1,687.9 1,499.1    
Change in provision for insured events of prior years (88.6) (71.0)    
Total incurred claims and claim adjustment expenses 1,599.3 1,428.1    
Claims and claim adjustment expenses attributable to insured events of the current year 393.6 366.6    
Claims and claim adjustment expenses attributable to insured events of prior years 1,005.8 921.0    
Total payments 1,399.5 1,287.6    
Amount of reserves for unpaid claims and claim adjustment expenses at the end of each period, net of reinsurance losses recoverable 8,120.4 7,700.8    
Gross reserves at end of period 14,356.4 12,957.6    
Specialty Insurance        
Liability for Unpaid Claims and Claims Adjustment Expense        
Net reserves at beginning of period     7,341.5 6,955.2
Provisions for insured events of the current year 1,638.8 1,453.9    
Change in provision for insured events of prior years (77.7) (55.8)    
Claims and claim adjustment expenses attributable to insured events of the current year 389.2 363.4    
Claims and claim adjustment expenses attributable to insured events of prior years 962.6 889.5    
Amount of reserves for unpaid claims and claim adjustment expenses at the end of each period, net of reinsurance losses recoverable 7,550.5 7,100.3    
Title Insurance        
Liability for Unpaid Claims and Claims Adjustment Expense        
Net reserves at beginning of period     572.7 598.5
Provisions for insured events of the current year 45.4 41.7    
Change in provision for insured events of prior years (9.0) (14.2)    
Claims and claim adjustment expenses attributable to insured events of the current year 2.6 2.2    
Claims and claim adjustment expenses attributable to insured events of prior years 40.9 29.5    
Amount of reserves for unpaid claims and claim adjustment expenses at the end of each period, net of reinsurance losses recoverable 565.4 594.1    
Other        
Liability for Unpaid Claims and Claims Adjustment Expense        
Net reserves at beginning of period     $ 6.4 $ 6.6
Provisions for insured events of the current year 3.7 3.5    
Change in provision for insured events of prior years (1.8) (0.8)    
Claims and claim adjustment expenses attributable to insured events of the current year 1.7 1.0    
Claims and claim adjustment expenses attributable to insured events of prior years 2.1 1.8    
Amount of reserves for unpaid claims and claim adjustment expenses at the end of each period, net of reinsurance losses recoverable $ 4.3 $ 6.4