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Basis of Presentation and Significant Accounting Policies (Narrative) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) State | Dec. 31, 2023 USD ($) | Dec. 31, 2022 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 |  |
Carrying values of equity method investments | $ 102.1 | $ 74.6 |
Loss from equity method investments | 7.4 | 5.4 | $ 11.0
Accrued Interest Receivable | 14.0 | 24.5 |
Restricted cash and cash equivalents | 20.7 | 4.0 |
Accrued Interest Receivable On Debt Securities | $ 38.8 | $ 35.1 |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Debt securities, Estimated fair value | Debt securities, Estimated fair value |
Fair values of investments in debt securities for funding of statutory premium reserves and state deposits | $ 92.4 | $ 107.0 |
Notes receivable | $ 34.4 | 22.4 |
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. |  |
Debt instrument, interest rate terms | Interest is due semi-annually on March 30 and September 30, beginning March 30, 2025. |  |
Impairment losses on property and equipment primarily related to impairments of internally developed software | $ 39.5 |  |
Impairment losses related to commercial real estate leases | $ 2.2 |  | 2.6
Assessment to determine fair value | 50.00% |  |
Escrow deposits | $ 8,900.0 | 10,600.0 |
Like-kind exchange funds | 2,300.0 | 1,800.0 |
Cash deposits with third party financial institutions | 901.0 | 830.5 |
Mortgage subservicing deposits interest bearing | 606.5 | 485.7 |
Nonconsolidated Variable Interest Entities |  |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |
Carrying values of equity method investments | 65.7 | 40.4 |
Loss from equity method investments | 71.7 |  |
Out-of-period Adjustment |  |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |
Increase in other operating expenses | 6.2 |  |
Increase in accounts payable and accrued liabilities | 6.2 |  |
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 | 4,000.0 | 6,300.0 |
Assets held-in-trust | 169.4 | 197.1 |
Mortgage subservicing deposits interest bearing | 606.5 | 485.7 |
Trust Assets Administered by FA Trust |  |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |
Assets held-in-trust | $ 4,800.0 | 4,400.0 |
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% |  |
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 | 10 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 | 1 year |  |
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 | 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 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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