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Trust Assets, Escrow and Other Deposits (Narrative) (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Aug. 31, 2025	Dec. 31, 2024
Other Assets [Line Items]
Escrow deposits	$ 11,600.0		$ 8,900.0
Assets held-in-trust	5,400.0		4,800.0
Like-kind exchange funds	2,400.0		2,300.0
Cash deposits	1,800.0		901.0
First American Trust
Other Assets [Line Items]
Escrow deposits	5,000.0		4,000.0
Assets held-in-trust	158.8		169.4
Cash deposits	1,300.0		$ 606.5
FA Trust
Other Assets [Line Items]
Like-kind exchange deposits held	$ 5.1
Mortgage Loan Subservicing Agreement
Other Assets [Line Items]
Secured interest in debt securities as collateral on deposit		$ 50.0

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- Definition

Cash deposits.

+ References

No definition available.

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X

- Definition

Like-kind exchange deposits held.

+ References

No definition available.

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- Definition

Like kind exchange funds.

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- Definition

Other assets.

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- Definition

Secured interest in debt securities as collateral on deposit.

+ References

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- Definition

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

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- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 440
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478522/954-440-50-1

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