Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Income Including the Noncontrolling Interests in Subsidiaries	$ 63,840	$ 38,667	$ 118,451	$ 98,673
Permanent Equity
Foreign Currency Translation Gain (Loss)	(9,539)	(722)	(1,875)	(479)
Reclassification Adjustment Related to Foreign Currency Items	0	0	0	(191)
Reclassification Adjustment Related to Equity Securities	0	0	0	(29)
Temporary Equity
Foreign Currency Translation Gain (Loss)	(4,600)	0	(886)	0
Other Comprehensive Income (Loss), net of tax	(14,139)	(722)	(2,761)	(699)
Comprehensive Income Including the Noncontrolling Interests in Subsidiaries	49,701	37,945	115,690	97,974
Less: Comprehensive Income (Loss) Attributable to Redeemable Noncontrolling Interest in Subsidiaries	(3,484)	(155)	295	(480)
Comprehensive Income Attributable to Federated Investors, Inc.	$ 53,185	$ 38,100	$ 115,395	$ 98,454