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SEGMENT INFORMATION - Schedule of Depreciation and Amortization Relating to Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	$ 98.0	$ 101.8	$ 91.2
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	74.0	77.5	76.6
Operating Segments \| GPC
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	34.7	36.7	37.4
Operating Segments \| H&G
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	19.2	19.4	18.8
Operating Segments \| HPC
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	20.1	21.4	20.4
Corporate and shared operations
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	$ 24.0	$ 24.3	$ 14.6

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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