Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Insurance [Abstract]
Provision for title loss, percentage of title premiums and escrow fees	3.00%	3.50%	3.00%	3.50%
Ultimate loss rate			3.75%	3.75%
Percentage reserve releases for prior policy years			0.75%	0.25%
Reserve releases for prior policy years	$ 8.6	$ 2.9	$ 15.9	$ 5.4