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Supplemental Balance Sheet Information - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 187.9 $ 192.3  
Less accumulated depreciation (78.0) (83.0)  
Property, plant and equipment, net 109.9 109.3  
Capital expenditures in accounts payable 4.5 5.8 $ 5.6
Net property, plant and equipment 109.9 109.3  
Depreciation expense 19.0 20.0 $ 17.0
United States      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, net 57.0 58.0  
Net property, plant and equipment 57.0 58.0  
Land      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 1.0 0.0  
Buildings and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 41.0 39.1  
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 124.4 136.8  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 21.5 16.4  
Accounts Payable      
Property, Plant and Equipment [Line Items]      
Capital expenditures in accounts payable $ 3.0 $ 5.0