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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2020
Property, Plant and Equipment      
Less accumulated depreciation $ (980.6) $ (977.0)  
Property, plant and equipment, net 594.4 617.8 $ 631.6
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 25.6 27.1  
Buildings      
Property, Plant and Equipment      
Property, plant and equipment, gross 396.2 410.8  
Machinery and equipment      
Property, Plant and Equipment      
Property, plant and equipment, gross 940.1 972.0  
Computer software      
Property, Plant and Equipment      
Property, plant and equipment, gross 141.0 144.3  
Construction in progress      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 72.1 $ 40.6