XML 61 R52.htm IDEA: XBRL DOCUMENT
v3.25.2

Equity Securities - (Summary of Changes in Carrying Amounts of Non Marketable Equity Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |  |  |
Carrying amount, beginning of period |  |  | $ 202.4 |
Carrying amount, end of period | $ 218.3 |  | 218.3 |
Non Marketable Equity Securities |  |  |  |
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |  |  |
Carrying amount, beginning of period | 216.6 | $ 226.1 | 202.4 | $ 224.1
Net additions | 0.2 | 1.3 | 15.2 | 3.1
Gross unrealized gains | 1.5 | 1.2 | 1.5 | 1.4
Gross unrealized losses and impairments | 0.0 | (2.8) | (0.8) | (2.8)
Carrying amount, end of period | $ 218.3 | $ 225.8 | $ 218.3 | $ 225.8

X
- Definition Equity securities net additions. + References No definition available. + Details
Name: | faf_EquitySecuritiesNetAdditions
Namespace Prefix: | faf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity securities without readily determinable fair value amount unrealized gain. + References No definition available. + Details
Name: | faf_EquitySecuritiesWithoutReadilyDeterminableFairValueAmountUnrealizedGain
Namespace Prefix: | faf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity securities without readily determinable fair value amount unrealized loss. + References No definition available. + Details
Name: | faf_EquitySecuritiesWithoutReadilyDeterminableFairValueAmountUnrealizedLoss
Namespace Prefix: | faf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=faf_NonMarketableEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |