Commitments and Contingencies - Schedule of Environmental Remediation Reserve Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Environmental remediation reserve activity
Beginning remediation accrual balance	$ 2.8	$ 3.2	$ 2.9
Current period expenses	0.3	0.1	1.2
Cash expenditures	(0.4)	(0.5)	(0.9)
Ending remediation accrual balance	$ 2.7	$ 2.8	$ 3.2