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Property, Plant and Equipment Property, Plant and Equipment (Tables) (Details) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 6.6 $ 6.8
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (1.0) (0.8)
Property, Plant and Equipment, Net $ 5.6 $ 6.0