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Earnings Per Share Attributable to Federated Investors, Inc. Shareholders Earnings Pe Share Attributable to Federated Investors, Inc. Shareholders Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income attributable to Federated Investors, Inc. $ 49,641 $ 45,443
Less: Total income available to participating unvested restricted shareholders, basic [1] (1,964) (1,828)
Less: Total income available to participating unvested restricted shareholders, diluted [1] (1,964) (1,828)
Total net income attributable to Federated Common Stock, basic [2] 47,677 43,615
Total net income attributable to Federated Common Stock, diluted [2] $ 47,677 $ 43,615
Net income attributable to Federated Common Stock - Basic and Diluted [2] $ 0.49 $ 0.44
Weighted Average Number of Shares Outstanding, Diluted [Abstract]    
Basic weighted-average Federated Common Stock [2] 97,863 99,802
Dilutive potential shares from stock options 1 1
Diluted weighted-average Federated Common Stock [2] 97,864 99,803
[1] Income available to participating unvested restricted shareholders includes dividends paid on unvested restricted shares and their proportionate share of undistributed earnings.
[2] Federated Common Stock excludes unvested restricted shares which are deemed participating securities in accordance with the two-class method of computing earnings per share.