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Property, Plant and Equipment (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Depreciation $ 1.4 $ 0.6
Sale price assets and property, net 4.8 1.2
Net carrying value of assets retired 0.2  
Gain on sales of assets 4.6 1.2
Proceeds from sale of assets and property 4.7 1.5
Sale proceeds included in accounts receivable $ 0.2 $ 0.1