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Accumulated Other Comprehensive Income (Loss) Attributable to Federated Investors, Inc. Shareholders (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jan. 01, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance     $ 595,784 $ 648,972  
Other comprehensive income, net of tax $ 90 $ 1,447 689 4,002  
Balance 653,797 680,893 653,797 680,893  
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance     (523) (4,609)  
Other comprehensive income (loss) before reclassifications and tax     3,243 3,688  
Tax impact     (1,339) (1,339)  
Reclassification adjustments, before tax     (2,151) 2,632  
Tax impact     936 (966)  
Other comprehensive income, net of tax     689 4,015  
Balance 166 (594) 166 (594)  
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Member] | Accounting Standards Update 2015-02 [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Adoption of new accounting pronouncements         $ 831
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance [1]     908 (3,795)  
Other comprehensive income (loss) before reclassifications and tax [1]     2,391 4,185  
Tax impact [1]     (1,041) (1,512)  
Reclassification adjustments, before tax [1]     (2,151) 2,632 [2]  
Tax impact [1]     936 (966) [2]  
Other comprehensive income, net of tax [1]     135 4,339  
Balance [1] 1,043 544 1,043 544  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance     (1,431) (814)  
Other comprehensive income (loss) before reclassifications and tax     852 (497)  
Tax impact     (298) 173  
Reclassification adjustments, before tax     0 0  
Tax impact     0 0  
Other comprehensive income, net of tax     554 (324)  
Balance (877) (1,138) (877) (1,138)  
Retained Earnings [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance     529,749 545,785  
Balance $ 598,901 $ 607,161 $ 598,901 $ 607,161  
Retained Earnings [Member] | Accounting Standards Update 2015-02 [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Adoption of new accounting pronouncements         $ (831)
[1] Other than as described in footnote 2 below, amounts reclassified from Accumulated other comprehensive income (loss), net of tax were recorded in Gain on securities, net on the Consolidated Statements of Income.
[2] Amount includes reclassification of $0.8 million, net of tax from Accumulated other comprehensive income (loss), net of tax to Retained earnings on the Consolidated Balance Sheets as a result of the adoption of ASU 2015-02, Consolidation (Topic 810): Amendment to the Consolidation Analysis.