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Goodwill (Carrying Amount of Goodwill by Reportable Segment) (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2024
USD ($)
Goodwill [Line Items]  
Balance at beginning of period $ 1,807.5
Acquisitions 2.8
Foreign currency translation (2.0)
Balance at end of period 1,808.3
Title Insurance and Services  
Goodwill [Line Items]  
Balance at beginning of period 1,766.6
Acquisitions 2.8
Foreign currency translation (2.0)
Balance at end of period 1,767.4
Home Warranty  
Goodwill [Line Items]  
Balance at beginning of period 40.9
Acquisitions 0.0
Foreign currency translation 0.0
Balance at end of period $ 40.9