Commitments, Contingencies and Uncertainties (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Operating leases, future minimum payments due	$ 410.1
Revenue Equipment [Member]
Operating Leased Assets [Line Items]
Operating leases, future minimum payments due	$ 73.0
Operating lease term	4 years