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Goodwill (Carrying Amounts of Goodwill by Reportable Segment) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 1,807.5 $ 1,798.2
Acquisitions 1.4 7.5
Dispositions   (0.9)
Foreign currency translation (4.6) 2.7
Goodwill, Ending Balance 1,804.3 1,807.5
Title Insurance and Services    
Goodwill [Line Items]    
Goodwill, Beginning Balance 1,766.6 1,757.3
Acquisitions 1.4 7.5
Dispositions   (0.9)
Foreign currency translation (4.6) 2.7
Goodwill, Ending Balance 1,763.4 1,766.6
Home Warranty    
Goodwill [Line Items]    
Goodwill, Beginning Balance 40.9 40.9
Acquisitions 0.0 0.0
Dispositions   0.0
Foreign currency translation 0.0 0.0
Goodwill, Ending Balance $ 40.9 $ 40.9