Leases - Supplemental Cash Flow Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 24.1
Operating cash flows for finance leases	0.7
Financing cash flows for finance leases	7.3
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	0.5
Finance leases	$ 0.0