Leases - Supplemental Balance Sheet (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases:
Operating lease right-of-use assets	$ 38.1
Current portion of operating lease liabilities	13.3
Operating lease liabilities, net of current portion	31.3
Finance leases:
Property, plant and equipment, net	39.1
Other current liabilities	0.5
Other long-term liabilities	$ 38.9