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Property, net (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Property, net      
Land $ 4.6 $ 4.8  
Buildings and improvements 399.0 397.6  
Machinery and equipment 1,201.6 1,244.3  
Internal-use software 540.7 522.4  
Construction in progress 142.9 156.4  
Total 2,288.8 2,325.5  
Less: Accumulated depreciation (1,702.3) (1,743.6)  
Property, net $ 586.5 $ 581.9 $ 574.4