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Redeemable Noncontrolling Interest in Subsidiaries - Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($)
Noncontrolling Interest [Abstract] |
Contributions from noncontrolling Interest | $ 892.1

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- Definition Temporary Equity, Contribution from Noncontrolling Interests in Subsidiaries + References No definition available. + Details
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Namespace Prefix: | fhi_
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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