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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 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Net income attributable to Federated Investors, Inc. $ 47,610 $ 44,131 $ 41,759 $ 36,307 $ 39,613 $ 37,560 $ 36,869 $ 35,194 $ 169,807 $ 149,236 $ 162,177
Less: Total income available to participating unvested restricted shareholders, basic [1]                 (6,608) (5,823) (6,065)
Less: Total income available to particpating unvested restricted shareholders, diluted [1]                 (6,608) (5,823) (6,065)
Total net income attributable to Federated Common Stock - Basic [2]                 163,199 143,413 156,112
Total net income attributable to Federated Common Stock - Diluted [2]                 $ 163,199 $ 143,413 $ 156,112
Earnings Per Share—Basic and Diluted $ 0.46 $ 0.42 $ 0.40 $ 0.35 $ 0.38 $ 0.36 $ 0.35 $ 0.34 $ 1.62 [2] $ 1.42 [2] $ 1.55 [2]
Weighted Average Number of Shares Outstanding [Abstract]                      
Basic weighted-average common shares outstanding                 100,475 100,721 100,668
Dilutive potential shares from stock options                 2 2 1
Diluted weighted-average common shares outstanding                 100,477 100,723 100,669
[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 stock which are deemed participating securities in accordance with the two-class method of computing earnings per share.