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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

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