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SEGMENT INFORMATION - Depreciation and Amortization Relating to Segments (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization $ 99.3 $ 117.0 $ 114.6
Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 84.7 102.4 100.0
Operating Segments | HPC      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 28.7 44.0 35.2
Operating Segments | GPC      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 37.4 39.2 44.4
Operating Segments | H&G      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 18.6 19.2 20.4
Corporate and shared operations      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization $ 14.6 $ 14.6 $ 14.6