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Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]        
Known title claims, amount $ 57.7 $ 55.5    
Incurred but not reported claims, amount 1,136.3 1,186.5    
Non-title claims, amount 36.0 40.4    
Total loss reserves, amount $ 1,230.0 $ 1,282.4 $ 1,299.5 $ 1,325.3
Known title claims, percent 4.70% 4.30%    
Incurred but not reported claims, percent 92.40% 92.50%    
Total title claims, percent 97.10% 96.80%    
Non-title claims, percent 2.90% 3.20%    
Total loss reserves, percent 100.00% 100.00%    
Title Claims        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total loss reserves, amount $ 1,194.0 $ 1,242.0