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Consolidation Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jan. 27, 2017
Variable Interest Entities [Line Items] |  |  |  |  |  |
Accounts receivable from Federated Funds | $ 27,100 | $ 24,900 |  | $ 24,900 |  |
Total Fee Waivers |  | 83,800 | $ 113,900 | 259,100 | $ 356,000 |
Investments—consolidated investment companies | 58,072 | 45,046 |  | 45,046 |  |
Nonredeemable noncontrolling interest in subsidiary | 958 | 0 |  | 0 |  |
Receivables | 44,804 | 45,530 |  | 45,530 |  |
Financial Support, Fee Waivers [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Nonconsolidated Legal Entity, Financial Support Amount |  | 53,100 | 82,400 | 166,700 | 262,100 |
Financial Support, Capital Contributions [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Nonconsolidated Legal Entity, Financial Support Amount |  | 0 | $ 0 | 0 | $ 0 |
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Investments—consolidated investment companies | 43,200 | 43,400 |  | 43,400 |  |
Redeemable noncontrolling interest in subsidiaries | 28,300 | 28,600 |  | 28,600 |  |
Liabilities | 700 | 600 |  | 600 |  |
Federated's maximum risk of loss in consolidated investment companies | 14,900 | 15,100 |  | 15,100 |  |
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Carrying Value of investment of nonconsolidated VIEs | 2,300 | 1,200 |  | 1,200 |  |
Federated's maximum risk of loss in consolidated investment companies | 2,300 | 1,200 |  | 1,200 |  |
AUM for nonconsolidated Federated Funds | 76,300 | 15,800 |  | 15,800 |  |
Cash and Cash Equivalents [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Consolidated VIE assets | 0 | 100 |  | 100 |  |
Trade Accounts Receivable [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Consolidated VIE assets | $ 700 | 800 |  | 800 |  |
General Partnership and VIE [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Receivables |  |  |  |  |  | $ 1,100
General Partnership and VIE [Member] | Passport [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 50.50% |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 49.50% |  |  |  |  |
General Partnership and VIE [Member] | Deconsolidation [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Liabilities |  |  |  |  |  | 5,300
Nonredeemable noncontrolling interest in subsidiary |  |  |  |  |  | 1,000
General Partnership and VIE [Member] | Cash and Cash Equivalents [Member] | Deconsolidation [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Consolidated VIE assets |  |  |  |  |  | 4,800
General Partnership and VIE [Member] | Trade Accounts Receivable [Member] | Deconsolidation [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Consolidated VIE assets |  |  |  |  |  | $ 2,600
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Investments—consolidated investment companies | $ 14,900 | 1,600 |  | 1,600 |  |
Redeemable noncontrolling interest in subsidiaries | $ 3,100 | $ 400 |  | $ 400 |  |

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