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Consolidation - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Accounts receivable from Federated Funds	$ 37,600,000	$ 35,000,000.0
Fee Waivers	427,300,000	358,200,000	$ 345,500,000
Investments, deconsolidation	6,200,000
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
AUM for nonconsolidated Federated Funds	9,600,000,000
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary | Cash and Cash Equivalents
Variable Interest Entity [Line Items]
Federated's maximum risk of loss in non-consolidated investment companies	111,900,000
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary | Accounts Receivable
Variable Interest Entity [Line Items]
Federated's maximum risk of loss in non-consolidated investment companies	15,400,000	16,200,000
Financial Support, Fee Waivers
Variable Interest Entity [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	311,600,000	242,900,000	222,100,000
Financial Support, Capital Contributions
Variable Interest Entity [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	$ 0	$ 0	$ 0

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