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Basis of Presentation and Significant Accounting Policies (Narrative) (Detail) $ in Millions | 12 Months Ended
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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

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