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Reserve for Known and Incurred but Not Reported Claims - Reconciliation of the Net Incurred and Paid Claims Development Tables to the Liability for Claims and Claim Adjustment Expense (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Claims Development [Line Items]        
Liability for unpaid claims and claim adjustment expenses - short-duration $ 28.7      
Total loss reserves, amount 1,193.4 $ 1,282.4 $ 1,325.3 $ 1,283.8
Property and casualty insurance        
Claims Development [Line Items]        
Liability for unpaid claims and claim adjustment expenses - short-duration 13.3      
Home warranty        
Claims Development [Line Items]        
Liability for unpaid claims and claim adjustment expenses - short-duration 15.4      
Title Insurance Product Line        
Claims Development [Line Items]        
Total loss reserves, amount $ 1,164.7 $ 1,242.0