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Accumulated Other Comprehensive Income (Loss) Attributable to Federated Hermes, Inc. Shareholders (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,041,280	$ 857,121	$ 761,215
Other Comprehensive Income (Loss), net of tax	22,013	21,275	(19,836)
Ending balance	1,136,997	1,041,280	857,121
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(249)	(14,617)	(790)
Other Comprehensive Income (Loss) Before Reclassifications and Tax	15,420	14,368	(13,607)
Reclassification Adjustment, before tax			(322)
Tax Impact			102
Other Comprehensive Income (Loss), net of tax	15,420	14,368	(13,827)
Ending balance	15,171	(249)	(14,617)
Unrealized Gain (Loss) on Equity Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	0	0	29
Other Comprehensive Income (Loss) Before Reclassifications and Tax	0	0	0
Reclassification Adjustment, before tax			(80)
Tax Impact			51
Other Comprehensive Income (Loss), net of tax	0	0	(29)
Ending balance	0	0	0
Foreign Currency Translation Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(249)	(14,617)	(819)
Other Comprehensive Income (Loss) Before Reclassifications and Tax	15,420	14,368	(13,607)
Reclassification Adjustment, before tax			(242)
Tax Impact			51
Other Comprehensive Income (Loss), net of tax	15,420	14,368	(13,798)
Ending balance	$ 15,171	$ (249)	$ (14,617)

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