Annual report pursuant to Section 13 and 15(d)

Nature of Operations - Property, Plant and Equipment (Details)

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Nature of Operations - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment $ 296.1 $ 310.6
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 205.9 212.5
China    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 78.0 85.0
Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment $ 12.2 $ 13.1