Leases - Lease Cost (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 41.2
Short-term cost	3.5
Variable lease cost	1.5
Amortization of leased assets	0.2
Interest on lease liabilities	0.1
Total lease cost	$ 46.5