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Consolidation - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Accounts receivable from Federated Funds | $ 42,000,000 |  | $ 42,000,000 |  | $ 27,400,000
Fee waivers | 89,300,000 | $ 83,800,000 | 264,900,000 | $ 259,200,000 |
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary | Receivables from Federated Funds |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Federated's maximum risk of loss in non-consolidated investment companies | 19,200,000 |  | 19,200,000 |  | 2,300,000
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary | Investments—Affiliates and Other |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Federated's maximum risk of loss in non-consolidated investment companies |  |  |  |  | 900,000
AUM for nonconsolidated Federated Funds |  |  |  |  | $ 55,800,000
Financial Support, Fee Waivers |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Money market funds which meet the scope exception of the consolidation guidance | 61,300,000 | 53,100,000 | 178,900,000 | 166,700,000 |
Financial Support, Capital Contributions |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Money market funds which meet the scope exception of the consolidation guidance | $ 0 | $ 0 | $ 0 | $ 0 |

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