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Property, Plant and Equipment, Net (Components of Property, Plant and Equipment, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property, Plant, and Equipment, Net    
Land and improvements $ 33.5 $ 34.8
Buildings and improvements 394.3 347.4
Machinery and equipment 2,040.1 1,800.4
Office equipment and other 325.3 303.6
Property, plant and equipment, gross 2,793.2 2,486.2
Accumulated depreciation (1,738.6) (1,487.2)
Property, plant and equipment, net $ 1,054.6 $ 999.0