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Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 21, 2017
Entity Registrant Name	FEDERATED INVESTORS INC /PA/
Entity Central Index Key	0001056288
Trading Symbol	FII
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2017
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Amendment Flag	false
Subsequent Event [Member] | Class A [Member]
Entity Common Stock, Shares Outstanding		9,000
Subsequent Event [Member] | Class B [Member]
Entity Common Stock, Shares Outstanding		101,950,188

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