XML 104 R87.htm IDEA: XBRL DOCUMENT
v3.22.0.1

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

X
- 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

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