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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Net income attributable to Federated Investors, Inc. $ 56,439 $ 54,925 $ 159,531 $ 153,077
Less: Total income available to participating unvested restricted shareholders, basic [1] (2,220) (2,035) (6,342) (5,987)
Less: Total income available to participating unvested restricted shareholders, diluted [1] (2,220) (2,035) (6,342) (5,987)
Total net income attributable to Federated Common Stock, basic [2] 54,219 52,890 153,189 147,090
Total net income attributable to Federated Common Stock, diluted [2] $ 54,219 $ 52,890 $ 153,189 $ 147,090
Net income attributable to Federated Common Stock - Basic and Diluted [2] $ 0.56 $ 0.54 $ 1.57 $ 1.48
Weighted Average Number of Shares Outstanding, Diluted [Abstract]        
Basic weighted-average Federated Common Stock [2] 97,128 98,805 97,521 99,397
Dilutive potential shares from stock options 1 1 1 1
Diluted weighted-average Federated Common Stock [2] 97,129 98,806 97,522 99,398
[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.