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Consolidation - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Variable Interest Entity [Line Items] |  |
Accounts receivable from Federated Funds | $ 35,000,000 | $ 27,400,000
Fee Waivers | 358,200,000 | 345,500,000
Financial Support, Fee Waivers |  |
Variable Interest Entity [Line Items] |  |
Money market funds | 242,900,000 | 222,100,000
Financial Support, Capital Contributions |  |
Variable Interest Entity [Line Items] |  |
Money market funds | 0 | 0
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
AUM for nonconsolidated Federated Funds |  | 55,800,000
Accounts Receivable | Non-Consolidated Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Federated's maximum risk of loss in non-consolidated investment companies | $ 16,200,000 | 2,300,000
Investments—Affiliates and Other | Non-Consolidated Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Federated's maximum risk of loss in non-consolidated investment companies |  | $ 900,000

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