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Consolidation (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 27, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Variable Interest Entity [Line Items] |  |  |
Accounts receivable from Federated Funds |  | $ 27,400 | $ 27,100
Fee Waivers |  | 345,400 | 460,700
Investments—consolidated investment companies |  | 45,411 | 58,072
Nonredeemable noncontrolling interest in subsidiary |  | 0 | 958
Receivables |  | 53,482 | 44,804
Financial Support, Fee Waivers [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Nonconsolidated Legal Entity, Financial Support Amount |  | 222,100 | 338,600
Financial Support, Capital Contributions [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Nonconsolidated Legal Entity, Financial Support Amount |  | 0 | 0
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments—consolidated investment companies |  | 39,700 | 43,200
Redeemable noncontrolling interests in subsidiaries |  | 27,700 | 28,300
Liabilities |  | 400 | 700
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Federated's maximum risk of loss in consolidated investment companies |  | 900 | 2,300
AUM for nonconsolidated Federated Funds |  | 55,800 | 76,300
Cash and Cash Equivalents [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Consolidated VIE assets |  | 100 | 0
Trade Accounts Receivable [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Consolidated VIE assets |  | 1,000 | 700
GeneralPartnershipandVIE [Member] | Passport [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Noncontrolling interest, ownership percentage by parent | 50.50% |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 49.50% |  |
GeneralPartnershipandVIE [Member] | Deconsolidation [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Liabilities | $ 5,300 |  |
Nonredeemable noncontrolling interest in subsidiary | 1,000 |  |
GeneralPartnershipandVIE [Member] | Cash and Cash Equivalents [Member] | Deconsolidation [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Consolidated VIE assets | 4,800 |  |
GeneralPartnershipandVIE [Member] | Trade Accounts Receivable [Member] | Deconsolidation [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Consolidated VIE assets | $ 2,600 |  |
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments—consolidated investment companies |  | 5,700 | 14,900
Redeemable noncontrolling interests in subsidiaries |  | $ 2,500 | $ 3,100

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