XML 56 R49.htm IDEA: XBRL DOCUMENT
v3.24.2

Debt Securities (Composition of Debt Securities Portfolio in Unrealized Loss Position by Credit Rating Agencies) (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 6,314.9 | $ 5,879.6
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 150.6 |
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 1,110.1 |
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 139.1 |
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 199.8 |
Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 3,647.4 |
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 749.2 |
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | 318.7 |
Investment Grade | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 5,812.9 |
Percentage of debt securities in unrealized loss position | 92.10% |
Investment Grade | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 431.7 |
Percentage of debt securities in unrealized loss position | 6.80% |
Investment Grade | U.S. Treasury bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 150.6 |
Percentage of debt securities in unrealized loss position | 100.00% |
Investment Grade | U.S. Treasury bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Investment Grade | Municipal bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 1,092.5 |
Percentage of debt securities in unrealized loss position | 98.40% |
Investment Grade | Municipal bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 17.3 |
Percentage of debt securities in unrealized loss position | 1.60% |
Investment Grade | Foreign government bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 137.2 |
Percentage of debt securities in unrealized loss position | 98.60% |
Investment Grade | Foreign government bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 1.2 |
Percentage of debt securities in unrealized loss position | 0.90% |
Investment Grade | Governmental agency bonds | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 199.8 |
Percentage of debt securities in unrealized loss position | 100.00% |
Investment Grade | Governmental agency bonds | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Investment Grade | Governmental agency mortgage-backed securities | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 3,647.4 |
Percentage of debt securities in unrealized loss position | 100.00% |
Investment Grade | Governmental agency mortgage-backed securities | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Investment Grade | U.S. corporate debt securities | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 400.7 |
Percentage of debt securities in unrealized loss position | 53.50% |
Investment Grade | U.S. corporate debt securities | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 295.5 |
Percentage of debt securities in unrealized loss position | 39.40% |
Investment Grade | Foreign corporate debt securities | A- or higher |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 184.7 |
Percentage of debt securities in unrealized loss position | 58.00% |
Investment Grade | Foreign corporate debt securities | BBB+ to BBB- |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 117.7 |
Percentage of debt securities in unrealized loss position | 36.90% |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 70.3 |
Percentage of debt securities in unrealized loss position | 1.10% |
Non-Investment Grade | U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.3 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.7 |
Percentage of debt securities in unrealized loss position | 0.50% |
Non-Investment Grade | Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 0.0 |
Percentage of debt securities in unrealized loss position | 0.00% |
Non-Investment Grade | U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 53.0 |
Percentage of debt securities in unrealized loss position | 7.10% |
Non-Investment Grade | Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value of debt securities, Unrealized loss position | $ 16.3 |
Percentage of debt securities in unrealized loss position | 5.10% |

X
- Definition Percentage of debt securities in unrealized losses position. + References No definition available. + Details
Name: | faf_PercentageOfDebtSecuritiesInUnrealizedLossesPosition
Namespace Prefix: | faf_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
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/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USTreasuryBondSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_DomesticCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_ForeignCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ExternalCreditRatingByGroupingAxis=us-gaap_ExternalCreditRatingInvestmentGradeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | faf_ExternalCreditRatingByGradeTypeAxis=faf_AMinusOrHigherRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | faf_ExternalCreditRatingByGradeTypeAxis=faf_BBBPlusToBBBMinusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ExternalCreditRatingByGroupingAxis=us-gaap_ExternalCreditRatingNonInvestmentGradeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |