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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues from external customers $ 6,003.5 $ 7,605.2 $ 9,220.8
Domestic | Title Insurance and Services      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues from external customers 5,351.6 7,128.4 7,871.7
Long-lived assets 977.2 1,000.9 944.9
Foreign | Title Insurance and Services      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues from external customers 372.2 416.2 448.1
Long-lived assets $ 53.0 $ 51.0 $ 51.1