Environmental (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Environmental remediation costs	$ 1.3	$ (0.9)	$ 1.6
Accrued environmental liability	101.9		$ 101.9	$ 103.7
Estimated time frame to remediate contigency			30
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Accrued environmental liability	$ 86.8		$ 86.8	$ 89.6