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, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment $ 418.1 $ 445.2
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 318.2 347.4
China    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 86.9 85.6
Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment $ 13.0 $ 12.2