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Contingent Liability Contingent Liability (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Environmental Remediation Term 10 years  
Environmental Exit Costs, Reasonably Possible Additional Losses, Low Estimate $ 0.3  
Environmental Exit Costs, Reasonably Possible Additional Losses, High Estimate 1.4  
Capitalizable Environmental Exit Costs 0.3  
Environmental Exit Costs, Liability for Remediation $ 0.2 $ 0.3