Leases - Supplemental Cash Flow (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 36.3
Operating cash flows from finance leases	0.1
Financing cash flows from finance leases	0.2
Leased assets obtained in exchange for new finance lease liabilities	0.0
Leased assets obtained in exchange for new operating lease liabilities	$ 19.1