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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
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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.

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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