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Losses, Claims and Settlement Expenses (Tables)
6 Months Ended
Jun. 30, 2025
Insurance [Abstract]  
Schedule of Changes in Aggregate Reserves for Losses, Claims and Settlement Expenses
The following table shows changes in aggregate reserves for the Company's loss and loss adjustment expenses:

Six Months Ended
June 30,
20252024
Gross reserves at beginning of period$13,727.7 $12,538.2 
Less: Reinsurance losses recoverable
5,807.1 4,977.7 
Net reserves at beginning of period:
Specialty Insurance
7,341.5 6,955.2 
Title Insurance572.7 598.5 
Other6.4 6.6 
Subtotal
7,920.6 7,560.4 
Incurred loss and loss adjustment expenses:
Provisions for insured events of the current year:
Specialty Insurance
1,638.8 1,453.9 
Title Insurance45.4 41.7 
Other3.7 3.5 
Subtotal
1,687.9 1,499.1 
Change in provision for insured events of prior years:
Specialty Insurance
(77.7)(55.8)
Title Insurance(9.0)(14.2)
Other(1.8)(0.8)
Subtotal
(88.6)(71.0)
Total incurred loss and loss adjustment expenses1,599.3 1,428.1 
Payments:
Loss and loss adjustment expenses attributable to
   insured events of the current year:
Specialty Insurance
389.2 363.4 
Title Insurance2.6 2.2 
Other1.7 1.0 
Subtotal
393.6 366.6 
Loss and loss adjustment expenses attributable to
   insured events of prior years:
Specialty Insurance
962.6 889.5 
Title Insurance40.9 29.5 
Other2.1 1.8 
Subtotal
1,005.8 921.0 
Total payments1,399.5 1,287.6 
Net reserves at end of period:
Specialty Insurance
7,550.5 7,100.3 
Title Insurance565.4 594.1 
Other4.3 6.4 
Subtotal
8,120.4 7,700.8 
Reinsurance losses recoverable6,236.0 5,256.7 
Gross reserves at end of period
$14,356.4 $12,957.6