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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Net income attributable to Federated Investors, Inc. $ 53,451 $ 52,709 $ 103,092 $ 98,152
Less: Total income available to participating unvested restricted shareholders, basic [1] (2,159) (2,118) (4,122) (3,947)
Less: Total income available to participating unvested restricted shareholders, diluted [1] (2,159) (2,118) (4,122) (3,947)
Total net income attributable to Federated Common Stock, basic [2] 51,292 50,591 98,970 94,205
Total net income attributable to Federated Common Stock, diluted [2] $ 51,292 $ 50,591 $ 98,970 $ 94,205
Net income attributable to Federated Common Stock - Basic and Diluted [2] $ 0.53 $ 0.51 $ 1.01 $ 0.94
Weighted Average Number of Shares Outstanding, Diluted [Abstract]        
Basic weighted-average Federated Common Stock [2] 97,581 99,592 97,722 99,697
Dilutive potential shares from stock options 1 1 1 1
Diluted weighted-average Federated Common Stock [2] 97,582 99,593 97,723 99,698
[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.