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Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]        
Known title claims, amount $ 55.3 $ 55.5    
IBNR title claims, amount 1,109.4 1,186.5    
Non-title claims, amount 28.7 40.4    
Total loss reserves, amount $ 1,193.4 $ 1,282.4 $ 1,325.3 $ 1,283.8
Known title claims, percent 4.60% 4.30%    
IBNR title claims, percent 93.00% 92.50%    
Total title claims, percent 97.60% 96.80%    
Non-title claims, percent 2.40% 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 $ 1,164.7 $ 1,242.0