Environmental (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Environmental remediation costs	$ 14.8	$ 13.1	$ 6.6
Accrued environmental liability	$ 110.2	103.7
Length of Time for Environmental Remediation	30 years
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Accrued environmental liability	$ 93.8	$ 89.6