Environmental (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Loss Contingencies [Line Items]
Environmental remediation costs	$ 0.5	$ (0.9)	$ 1.3
Accrued environmental liability		$ 91.3		$ 96.4
Estimated time frame to remediate contigency		30
Business Combination, Indemnification Assets, Amount as of Acquisition Date		$ 4.6
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Accrued environmental liability		$ 82.9		$ 82.9