Consolidation - Consolidated Federated Fund VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Variable Interest Entities [Line Items]
Federated's Net Interest in Federated Fund VIEs	$ 4.2	$ 10.1
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure
Variable Interest Entities [Line Items]
Less: Liabilities	0.3	0.3
Less: Redeemable Noncontrolling Interest in Subsidiaries	9.5	11.2
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure | Investments—Consolidated Investment Companies
Variable Interest Entities [Line Items]
Consolidated VIE assets	13.6	21.2
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure | Receivables
Variable Interest Entities [Line Items]
Consolidated VIE assets	$ 0.4	$ 0.4