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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 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	$ 9.9	$ 8.6	$ 18.3	$ 15.9