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Supplemental Information (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Related Party Transaction [Line Items]        
Trade receivables, net   $ 1,700.4 $ 1,794.4  
Facility closure $ 23.2 0.0 0.0 $ 23.2
Related Party        
Related Party Transaction [Line Items]        
Sales and other income   380.0 300.0 $ 225.0
Trade receivables, net   $ 80.0 $ 55.0