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Schedule III - Balance Sheet Captions (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Supplementary Insurance Information By Segment [Line Items]    
Deferred policy acquisition costs $ 20.2 $ 20.0
Claims reserves 1,282.4 1,325.3
Deferred revenues 196.8 196.9
Title Insurance and Services    
Supplementary Insurance Information By Segment [Line Items]    
Deferred policy acquisition costs 0.0 0.0
Claims reserves 1,242.0 1,269.3
Deferred revenues 3.9 6.8
Home Warranty    
Supplementary Insurance Information By Segment [Line Items]    
Deferred policy acquisition costs 20.2 20.0
Claims reserves 15.7 19.5
Deferred revenues 192.9 190.1
Corporate and Eliminations    
Supplementary Insurance Information By Segment [Line Items]    
Deferred policy acquisition costs 0.0 0.0
Claims reserves 24.7 36.5
Deferred revenues $ 0.0 $ 0.0