Leases - Summary of Components of Lease Expense (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease cost
Operating lease cost	$ 2.3
Short-term lease cost	7.6
Variable lease cost	1.2
Finance lease cost
Amortization of right-of-use assets	3.1
Interest expense	0.4
Total lease cost	$ 14.6