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Schedule IV - Reinsurance (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Title Insurance and Services      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Premiums and escrow fees before reinsurance $ 4,321.2 $ 6,228.2 $ 6,880.0
Ceded to other companies 17.6 18.9 22.0
Assumed from other companies 2.1 1.2 0.0
Premiums and escrow fees $ 4,305.7 $ 6,210.5 $ 6,858.0
Percentage of amount assumed to premiums and escrow fees 0.00% 0.00% 0.00%
Home Warranty      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Premiums and escrow fees before reinsurance $ 395.6 $ 413.1 $ 399.8
Ceded to other companies 0.0 0.0 0.0
Assumed from other companies 0.0 0.0 0.0
Premiums and escrow fees $ 395.6 $ 413.1 $ 399.8
Percentage of amount assumed to premiums and escrow fees 0.00% 0.00% 0.00%
Corporate and Eliminations | Operating Segments      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Premiums and escrow fees before reinsurance $ 0.1 $ 9.4 $ 103.5
Ceded to other companies 0.0 0.6 5.8
Assumed from other companies 0.0 0.0 0.0
Premiums and escrow fees $ 0.1 $ 8.8 $ 97.7
Percentage of amount assumed to premiums and escrow fees 0.00% 0.00% 0.00%