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Goodwill (Carrying Amount of Goodwill by Reportable Segment) (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Goodwill [Line Items]  
Balance at beginning of period $ 1,804.3
Acquisitions 10.4
Foreign currency translation 3.8
Balance at end of period 1,818.5
Title Insurance and Services  
Goodwill [Line Items]  
Balance at beginning of period 1,763.4
Acquisitions 10.4
Foreign currency translation 3.8
Balance at end of period 1,777.6
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