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Segment Financial Information (Schedule of Total Revenues From External Customers And Long-Lived Assets) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers	$ 6,128.1	$ 6,003.5	$ 7,605.2
Domestic | Title Insurance and Services
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers	5,314.6	5,351.6	7,128.4
Long-lived assets	961.5	977.2	1,000.9
Foreign | Title Insurance and Services
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers	421.4	372.2	416.2
Long-lived assets	$ 55.5	$ 53.0	$ 51.0

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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