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Schedule III - Balance Sheet Captions (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Supplementary Insurance Information By Segment [Line Items]    
Deferred policy acquisition costs $ 21.7 $ 20.2
Claims reserves 1,193.4 1,282.4
Deferred revenues 210.4 196.8
Title Insurance and Services    
Supplementary Insurance Information By Segment [Line Items]    
Deferred policy acquisition costs 0.0 0.0
Claims reserves 1,164.7 1,242.0
Deferred revenues 4.0 3.9
Home Warranty    
Supplementary Insurance Information By Segment [Line Items]    
Deferred policy acquisition costs 21.7 20.2
Claims reserves 15.4 15.7
Deferred revenues 206.4 192.9
Corporate and Eliminations    
Supplementary Insurance Information By Segment [Line Items]    
Deferred policy acquisition costs 0.0 0.0
Claims reserves 13.3 24.7
Deferred revenues $ 0.0 $ 0.0