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Contingent Liability Contingent Liability (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2018
USD ($)
Loss Contingencies [Line Items]  
Environmental Exit Costs, Reasonably Possible Additional Losses, Low Estimate $ 1.4
Environmental Exit Costs, Liability for Remediation 1.0
Environmental Remediation Expense 0.5
Minimum [Member]  
Loss Contingencies [Line Items]  
Environmental Exit Costs, Anticipated Cost 0.9
Maximum [Member]  
Loss Contingencies [Line Items]  
Environmental Exit Costs, Anticipated Cost $ 2.0