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Revenue Recognition - Narrative (Details) | 3 Months Ended
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Mar. 31, 2024
Revenue Recognition and Deferred Revenue [Abstract] |
Home warranty contract, period | 1 year

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- Definition Home Warranty Contract, Period + References No definition available. + Details
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Namespace Prefix: | fnf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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