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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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