XML 60 R50.htm IDEA: XBRL DOCUMENT v3.23.1

Equity Securities - (Summary of Investments in Non Marketable Equity Securities) (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Equity Securities Without Readily Determinable Fair Value [Line Items]
Carrying amount	$ 384.7	$ 395.8
Non Marketable Equity Securities
Equity Securities Without Readily Determinable Fair Value [Line Items]
Cost	313.3	307.2
Unrealized gains	71.4	88.6
Carrying amount	$ 384.7	$ 395.8

X

- Definition

Equity securities without readily determinable fair value, cost.

+ References

No definition available.

+ Details

Name:	faf_EquitySecuritiesWithoutReadilyDeterminableFairValueCost
Namespace Prefix:	faf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714

+ 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

No definition available.

+ Details

Name:	us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714

+ Details

Name:	us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_InvestmentTypeAxis=faf_NonMarketableEquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: