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Basis of Presentation and Significant Accounting Policies (Narrative) (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
State
Dec. 31, 2021
USD ($)
Dec. 31, 2020
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 35    
Net investment (losses) gains (realized of $(85), $20, $15) $ (516.0) $ 436.0 $ 105.0
Non-Marketable Equity Securities 396.0 441.0  
Equity method investments 78.0 78.0  
Other assets 361.0 448.0  
Accrued Interest Receivable 17.0 2.0  
Accrued Interest Receivable On Debt Securities 38.0 34.0  
Fair values of investments in debt securities for funding of statutory premium reserves and state deposits 86.0 91.0  
Credit losses on notes receivable related to venture investment portfolio $ 28.0    
Period of mortgage loan sold description Collections of the receivable balance occur upon sale of the underlying mortgage loan to investors in the secondary market, generally within 30 days and more typically in less than 10 days.    
Impairment losses on property and equipment primarily related to impairments of internally developed software $ 1.0 5.0 18.0
Impairment losses related to commercial real estate leases $ 2.6   $ 1.0
Assessment to determine fair value 50.00%    
Escrow deposits $ 10,000.0 10,800.0  
Like-kind exchange funds 2,800.0 6,000.0  
Cash deposits with third party financial institutions 1,100.0 400.0  
Mortgage subservicing deposits interest bearing 713.0 0.0  
First American Trust      
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Escrow deposits 4,600.0 4,800.0  
Assets held-in-trust 4,100.0 $ 4,600.0  
Mortgage subservicing deposits interest bearing $ 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% 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 70.00%    
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 80.00%    
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]      
Leasehold improvements, estimated useful lives initially recorded at cost and are amortized over the lesser of the remaining term of the respective lease or the estimated useful life, using the straight-line method.    
Capitalized Software Costs | Minimum      
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful lives, years 1 year    
Capitalized Software Costs | Maximum      
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful lives, years 15 years    
Title Insurance and Services      
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Goodwill, impairment loss $ 0.0 $ 0.0 $ 0.0
Operating Segments      
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Net investment (losses) gains (realized of $(85), $20, $15) 516.0 436.0 105.0
Operating Segments | Specialty Insurance      
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Net investment (losses) gains (realized of $(85), $20, $15) $ 13.0 $ 23.0 $ 12.0