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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)