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SEGMENT INFORMATION - Capital Expenditures 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 capital expenditures $ 64.0 $ 43.6 $ 44.1
Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total capital expenditures 37.5 31.5 28.7
Operating Segments | HPC      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total capital expenditures 11.6 9.3 10.7
Operating Segments | GPC      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total capital expenditures 17.7 18.6 14.5
Operating Segments | H&G      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total capital expenditures 8.2 3.6 3.5
Corporate and shared operations      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total capital expenditures $ 26.5 $ 12.1 $ 15.4