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Basis of Presentation and Significant Accounting Policies (Narrative) (Detail)
$ in Millions
 12 Months Ended
Feb. 28, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
State
NotesReceivable
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Number of states company issues title insurance policies | State     49    
Number of states company issues home warranty contracts | State     36    
Accrued Interest Receivable     $ 24.5 $ 17.1  
Accrued Interest Receivable On Debt Securities     35.1 37.9  
Fair values of investments in debt securities for funding of statutory premium reserves and state deposits     107.0 86.0  
Notes receivable     $ 22.4 10.7  
Credit losses on notes receivable related to venture investment portfolio       27.7  
Number of notes included in receivable balance | NotesReceivable     2    
Period of mortgage loan sold description     Collections of amounts due from mortgage loan originators occur upon sale of the underlying mortgage loans to investors in the secondary market, generally within 30 days and more typically in less than 10 days.    
Promissory note receivable maturity date Aug. 31, 2024 Mar. 29, 2024      
Promissory note receivable extended maturity date Feb. 28, 2025 Sep. 30, 2024      
Promissory notes Interest rate description     Interest accrues on the notes at the one month SOFR rate plus 1.90% per annum or, plus 2.10% per annum, during the extension period.    
Interest accrues on promissory note receivable     2.10%    
Impairment losses on property and equipment primarily related to impairments of internally developed software     $ 1.1 0.6 $ 4.8
Impairment losses related to commercial real estate leases       2.6  
Assessment to determine fair value     50.00%    
Escrow deposits     $ 10,600.0 10,000.0  
Like-kind exchange funds     1,800.0 2,800.0  
Cash deposits with third party financial institutions     800.0 1,100.0  
Mortgage subservicing deposits interest bearing     485.7 712.9  
Revision of Prior Period Adjustment          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Decreases to retained earnings     (7.0)    
Decreases to deferred income tax liabilities     (2.5)    
Increase to other retirement plans liability     9.5    
First American Trust          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Escrow deposits     6,300.0 4,600.0  
Assets held-in-trust     4,400.0 4,100.0  
Mortgage subservicing deposits interest bearing     $ 500.0 $ 700.0  
Employee Stock Purchase Plan          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Employee stock purchase plan percentage of purchase price on closing price     85.00%    
Employee stock purchase plan percentage of discount purchase price on closing price     15.00%    
Capitalized Real Estate          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Capitalized real estate estimated useful lives, years     15 years    
Minimum          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Percentage of claim amounts known in the first few years of the policy life     65.00%    
Minimum | Other Intangible Assets          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Other intangible assets estimated useful lives, years     1 year    
Maximum          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Percentage of claim amounts known in the first few years of the policy life     75.00%    
Percentage of total premiums assumed and ceded in connection with reinsurance     1.00% 1.00% 1.00%
Maximum | Other Intangible Assets          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Other intangible assets estimated useful lives, years     20 years    
Buildings | Minimum          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Property, plant and equipment, estimated useful lives, years     3 years    
Buildings | Maximum          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Property, plant and equipment, estimated useful lives, years     40 years    
Furniture and Equipment | Minimum          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Property, plant and equipment, estimated useful lives, years     3 years    
Furniture and Equipment | Maximum          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Property, plant and equipment, estimated useful lives, years     15 years    
Leasehold Improvements          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]     us-gaap:UsefulLifeTermOfLeaseMember    
Capitalized Software Costs | Minimum          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Property, plant and equipment, estimated useful lives, years     2 years    
Capitalized Software Costs | Maximum          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Property, plant and equipment, estimated useful lives, years     15 years    
Promissory Note Dated September 30, 2022          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Promissory note receivable, principal balance   $ 202.6 $ 170.3 $ 186.9  
Promissory Note Dated February 28, 2023          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Promissory note receivable, principal balance $ 153.1   $ 148.8    
SOFR          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Interest accrues on promissory note receivable     1.90%    
Title Insurance and Services and Home Warranty          
Basis Of Presentation And Significant Accounting Policies [Line Items]          
Goodwill, impairment loss     $ 0.0 $ 0.0 $ 0.0