XML 57 R47.htm IDEA: XBRL DOCUMENT
v3.21.2

Concentration Risk - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Concentration Risk [Line Items] |  |  |  |
Voluntary yield-related fee waivers | $ 109.2 | $ 36.8 | $ 310.2 | $ 56.9
Decrease in distribution expenses | 72.3 | 33.0 | 204.9 | 51.0
Net negative pre-tax impact | $ 36.9 | $ 3.8 | $ 105.3 | $ 5.9

X
- Definition Decrease In Distribution Expenses + References No definition available. + Details
Name: | fhi_DecreaseInDistributionExpenses
Namespace Prefix: | fhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fee Waivers Net Of Distribution Expenses + References No definition available. + Details
Name: | fhi_FeeWaiversNetOfDistributionExpenses
Namespace Prefix: | fhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Voluntary Yield-related Fee Waivers + References No definition available. + Details
Name: | fhi_VoluntaryYieldRelatedFeeWaivers
Namespace Prefix: | fhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration