SEGMENT INFORMATION - Net sales and long-lived assets by geographic area (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 3,413.1	$ 3,552.7	$ 3,551.3
Property, plant & equipment	631.6	609.5
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	3,134.5	3,247.8	3,209.5
Property, plant & equipment	572.5	549.4
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	278.6	304.9	$ 341.8
Property, plant & equipment	$ 59.1	$ 60.1

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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