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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Land and improvements $ 41.8 $ 41.8
Buildings and improvements 337.3 331.7
Machinery and equipment 1,449.5 1,398.7
Construction in progress 46.3 22.5
Property, plant and equipment, gross 1,874.9 1,794.7
Less accumulated depreciation (907.6) (822.8)
Property, plant and equipment - net $ 967.3 $ 971.9