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Commitments and Contingencies - Narrative (Details) $ in Millions	Dec. 31, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Carried interest subject to clawback provisions	$ 11

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- Definition

Carried Interest Subject To Clawback Provisions

+ References

No definition available.

+ Details

Name:	fhi_CarriedInterestSubjectToClawbackProvisions
Namespace Prefix:	fhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration