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Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Insurance [Abstract]        
Known title claims, amount $ 60.8 $ 62.1    
Incurred but not reported claims, amount 1,193.2 1,207.2    
Total title claims, amount 1,254.0 1,269.3    
Non-title claims, amount 45.5 56.0    
Total loss reserves, amount $ 1,299.5 $ 1,325.3 $ 1,314.0 $ 1,283.8
Known title claims, percent 4.70% 4.70%    
Incurred but not reported claims, percent 91.80% 91.10%    
Total title claims, percent 96.50% 95.80%    
Non-title claims, percent 3.50% 4.20%    
Total loss reserves, percent 100.00% 100.00%