Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Income Including the Noncontrolling Interests in Subsidiaries	$ 73,585	$ 61,994	$ 192,036	$ 160,667
Permanent Equity
Foreign Currency Translation Gain (Loss)	(11,795)	(3,778)	(13,670)	(4,257)
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)	(5,544)	(1,781)	(6,430)	(1,781)
Other Comprehensive Income (Loss), net of tax	(17,339)	(5,559)	(20,100)	(6,258)
Comprehensive Income Including the Noncontrolling Interests in Subsidiaries	56,246	56,435	171,936	154,409
Less: Comprehensive Income (Loss) Attributable to Redeemable Noncontrolling Interest in Subsidiaries	(4,921)	605	(4,626)	125
Comprehensive Income Attributable to Federated Investors, Inc.	$ 61,167	$ 55,830	$ 176,562	$ 154,284