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Earnings Per Share Attributable to Federated Investors, Inc. Shareholders Earnings Per 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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net Income Attributable to Federated Investors, Inc. $ 38,822 $ 53,451 $ 99,153 $ 103,092
Less: Total Income Available to Participating Unvested Restricted Shareholders, Basic [1] (1,529) (2,159) (3,907) (4,122)
Less: Total Income Available to Participating Unvested Restricted Shareholders, Diluted [1] (1,529) (2,159) (3,907) (4,122)
Total Net Income Attributable to Federated Common Stock, Basic [2] 37,293 51,292 95,246 98,970
Total Net Income Attributable to Federated Common Stock, Diluted [2] $ 37,293 $ 51,292 $ 95,246 $ 98,970
Weighted Average Number of Shares Outstanding, Diluted [Abstract]        
Basic Weighted-Average Federated Common Stock [2] 97,193 97,581 97,191 97,722
Dilutive Potential Shares from Stock Options 1 1 1 1
Diluted Weighted-Average Federated Common Stock [2] 97,194 97,582 97,192 97,723
Net Income Attributable to Federated Common Stock - Basic and Diluted [2] $ 0.38 $ 0.53 $ 0.98 $ 1.01
[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.