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Supplemental Balance Sheet Information - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross $ 203.7   $ 203.7   $ 187.9
Less accumulated depreciation (80.2)   (80.2)   (78.0)
Total 123.5   123.5   109.9
Depreciation expense 3.2 $ 5.1 6.4 $ 10.0  
Land          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross 0.9   0.9   1.0
Buildings          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross 41.9   41.9   41.0
Machinery and equipment          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross 130.8   130.8   124.4
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross 30.1   30.1   $ 21.5
Construction in progress | ITS Plan          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross $ 10.7   $ 10.7