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Property, Plant and Equipment (Tables) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 6.8 $ 6.8
Property, Plant and Equipment, Additions 0.5  
Property, Plant and Equipment, Disposals (0.5)  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (1.9) (0.8)
Depreciation (1.4) (0.6)
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment 0.3  
Net carrying value of assets retired (0.2)  
Property, Plant And Equipment, Net Capital Expenditures (0.9)  
Property, Plant and Equipment, Net 4.9 6.0
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1.2 1.2
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3.2 3.0
Property, Plant and Equipment, Additions 0.2  
Property, Plant and Equipment, Disposals 0.0  
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1.3 1.7
Property, Plant and Equipment, Additions 0.1  
Property, Plant and Equipment, Disposals (0.5)  
Other Capitalized Property Plant and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1.1 $ 0.9
Property, Plant and Equipment, Additions $ 0.2