v3.26.3
Goodwill (Carrying Amount of Goodwill by Reportable Segment) (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2026
USD ($)
Goodwill [Line Items]  
Balance at beginning of period $ 1,819.3
Acquisitions 0.9
Foreign currency translation (1.9)
Balance at end of period 1,818.3
Title Insurance and Services  
Goodwill [Line Items]  
Balance at beginning of period 1,778.4
Acquisitions 0.9
Foreign currency translation (1.9)
Balance at end of period 1,777.4
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