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SEGMENT INFORMATION - Schedule of Segment Total Assets Relating to Segments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Other current assets	$ 738.1	$ 1,116.5
Non-current assets	2,195.4	2,263.7
Total assets	3,379.6	3,842.3
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	446.1	462.1
Operating Segments | GPC
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	161.4	159.4
Operating Segments | H&G
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	92.2	85.6
Operating Segments | HPC
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 192.5	$ 217.1

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