Commitments and Contingencies - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease, weighted-average remaining lease term	11 years 4 months 24 days
Operating lease cost	$ 3.0
Variable lease cost	1.8
Short-term lease payments	$ 67.1
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, weighted-average remaining lease term	1 month
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, weighted-average remaining lease term	26 years 9 months 18 days