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Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]        
Known title claims, amount $ 55.7 $ 55.3    
Incurred but not reported claims, amount 1,099.6 1,109.4    
Non-title claims, amount 24.0 28.7    
Total loss reserves, amount $ 1,179.3 $ 1,193.4 $ 1,230.0 $ 1,282.4
Known title claims, percent 4.70% 4.60%    
Incurred but not reported claims, percent 93.30% 93.00%    
Total title claims, percent 98.00% 97.60%    
Non-title claims, percent 2.00% 2.40%    
Total loss reserves, percent 100.00% 100.00%    
Title Claims        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total loss reserves, amount $ 1,155.3 $ 1,164.7