Commitments and Contingencies Narrative (Details) $ in Millions	Dec. 31, 2017 USD ($)
Unrecorded Unconditional Purchase Obligation	$ 40.9
Maximum performance incentive payable over remaining terms	31.0
Employment-related Commitments [Member]
Unrecorded Unconditional Purchase Obligation	$ 16.9	[1]

[1] Federated has certain domestic and international employment arrangements pursuant to which Federated is obligated to make minimum compensation payments.