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Schedule IV - Reinsurance (Detail) - Title Insurance and Services - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Premiums and escrow fees before reinsurance	$ 4,629.5	$ 4,321.2	$ 6,228.2
Ceded to other companies	21.1	17.6	18.9
Assumed from other companies	1.8	2.1	1.2
Premiums and escrow fees	$ 4,610.2	$ 4,305.7	$ 6,210.5
Percentage of amount assumed to premiums and escrow fees	0.00%	0.00%	0.00%

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