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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effect of Derivative Instruments on OCI and the Condensed, Consolidated Statements of Operations (Details) - Fair value, inputs, level 2 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Derivatives not designated as Hedging Instruments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain/(Loss) Recognized in Statement of Operations | $ (0.5) | $ (11.6)
Derivatives not designated as Hedging Instruments | Currency forward contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain/(Loss) Recognized in Statement of Operations | $ (0.3) | $ (9.6)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Operating Income (Expense), Net | Other Operating Income (Expense), Net
Derivatives not designated as Hedging Instruments | Commodity hedging instruments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain/(Loss) Recognized in Statement of Operations | $ (0.2) | $ (2.0)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Cost of sales | Cost of sales
Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain/(Loss) Recognized in AOCI | $ 2.9 | $ (7.9)
Reclassified from AOCL into Statement of Operations | 7.4 | 7.3
Cash Flow Hedging | Interest rate swap agreements |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain/(Loss) Recognized in AOCI | 2.3 | (7.1)
Reclassified from AOCL into Statement of Operations | 5.9 | 11.7
Cash Flow Hedging | Commodity hedging instruments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain/(Loss) Recognized in AOCI | 0.6 | (0.8)
Reclassified from AOCL into Statement of Operations | $ 1.5 | $ (4.4)

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