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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

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