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Basis of Financial Statements - Additional Information (Details) | Sep. 30, 2024
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Accounting Policies [Abstract] |
MRB, attributed fee ratio capped percentage | 100.00%

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- Definition Market Risk Benefit, Attributed Fee Ratio Capped Percentage + References No definition available. + Details
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Namespace Prefix: | fnf_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration