SEGMENT INFORMATION - Schedule of Segment Total Assets Relating to Segments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
Other current assets	$ 1,116.5	$ 2,463.1
Non-current assets	2,263.7	2,332.5
Total assets	3,842.3	5,258.4
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	462.1	462.8
Operating Segments | GPC
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	159.4	171.8
Operating Segments | H&G
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	85.6	90.7
Operating Segments | HPC
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 217.1	$ 200.3