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Goodwill (Carrying Amount of Goodwill by Reportable Segment) (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
Goodwill [Line Items]  
Balance at beginning of period $ 1,798.2
Acquisitions 2.6
Dispositions (0.9)
Foreign currency translation 0.2
Balance at end of period 1,800.1
Title Insurance and Services  
Goodwill [Line Items]  
Balance at beginning of period 1,757.3
Acquisitions 2.6
Dispositions (0.9)
Foreign currency translation 0.2
Balance at end of period 1,759.2
Home Warranty  
Goodwill [Line Items]  
Balance at beginning of period 40.9
Acquisitions 0.0
Dispositions 0.0
Foreign currency translation 0.0
Balance at end of period $ 40.9