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Basis of Financial Statements - Additional Information (Details)	Sep. 30, 2024
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