Commitments and Contingencies Environmental Health and Safety (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Environmental liability	$ 7.0
Other current assets
Loss Contingencies [Line Items]
Reimbursable environmental costs, current	0.2
Other current liabilities
Loss Contingencies [Line Items]
Environmental liabilities, current	$ 1.0	$ 1.0