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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Insurance [Abstract]        
Provision for title loss, percentage of title premiums and escrow fees 3.00% 3.00% 3.00% 3.00%
Ultimate loss rate 3.75% 3.75% 3.75% 3.75%
Percentage reserve releases for prior policy years 0.75% 0.75% 0.75% 0.75%
Reserve releases for prior policy years $ 10.5 $ 9.1 $ 28.8 $ 25.0