Leases - Supplemental Balance Sheet Information (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases
Operating lease assets, net	$ 77.4
Other current liabilities	$ 21.3
Other current liabilities (Balance sheet location)	Us-gaap:OtherLiabilitiesCurrent
Operating lease liability - long term	$ 58.3
Finance Leases
Property, plant and equipment, net	$ 0.5
Property, plant and equipment, net (Balance sheet location)	Us-gaap:PropertyPlantAndEquipmentNet
Current portion of long-term debt	$ 0.1
Current portion of long-term debt (Balance sheet location)	Us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt	$ 0.3
Long-term debt (Balance sheet location)	Us-gaap:LongTermDebtAndCapitalLeaseObligations
Weighted average remaining lease term
Operating leases	5 years 7 months 6 days
Finance leases	3 years 8 months 12 days
Weighted average discount rate
Operating leases	2.60%
Finance leases	1.90%