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Consolidation - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Fee waivers $ 98,800,000 $ 87,400,000  
Variable Interest Entities [Line Items]      
Investments, deconsolidation 6,200,000    
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entities [Line Items]      
Assets under management 5,200,000,000    
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary | Cash and Cash Equivalents      
Variable Interest Entities [Line Items]      
Federated's maximum risk of loss in non-consolidated investment companies 68,300,000    
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 24,300,000   $ 16,200,000
Financial Support, Fee Waivers      
Variable Interest Entities [Line Items]      
Money market funds which meet the scope exception of the consolidation guidance 68,100,000 57,900,000  
Financial Support, Capital Contributions      
Variable Interest Entities [Line Items]      
Money market funds which meet the scope exception of the consolidation guidance $ 0 $ 0