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Consolidation Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Variable Interest Entities [Line Items] |  |  |  |  |
Accounts receivable from Federated Funds | $ 23,000 |  | $ 23,000 |  | $ 27,400
Fee Waivers | 88,100 | $ 84,800 | 175,500 | $ 175,300 |
Investments—Consolidated Investment Companies | 33,603 |  | 33,603 |  | 45,411
Financial Support, Fee Waivers [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Nonconsolidated Legal Entity, Financial Support Amount | 59,600 | 53,800 | 117,500 | 113,600 |
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 | 31,700 |  | 31,700 |  | 39,700
Redeemable noncontrolling interest in subsidiaries | 20,300 |  | 20,300 |  | 27,700
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Carrying Value of investment of nonconsolidated VIEs | 1,000 |  | 1,000 |  | 900
Federated's maximum risk of loss in non-consolidated investment companies | 1,000 |  | 1,000 |  | 900
AUM for nonconsolidated Federated Funds | 66,500 |  | 66,500 |  | 55,800
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Investments—Consolidated Investment Companies | 1,900 |  | 1,900 |  | 5,700
Redeemable noncontrolling interest in subsidiaries | $ 700 |  | $ 700 |  | $ 2,500

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