Basis of Condensed Consolidated Financial Statements (Narrative) (Details) - Out-of-period Adjustment $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($)
Accounts Payable and Accrued Liabilities
Basis Of Condensed Consolidated Financial Statements [Line Items]
Increase in other operating expenses and increased accounts payable and accrued liabilities	$ 6.2
Increased Other Operating Expense
Basis Of Condensed Consolidated Financial Statements [Line Items]
Increase in other operating expenses and increased accounts payable and accrued liabilities	$ 6.2

Amount related to effect on financial statements related to corrections of prior year errors in the current year financial statements when the effect of the prior year error was immaterial to the prior year financial statements and the current year correction is immaterial to the current year financial statements.

No definition available.

Name:	faf_ImmaterialErrorCorrectionAmount
Namespace Prefix:	faf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration