DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Fair Value of Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2026	Sep. 30, 2025
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 4.7	$ 7.9
Liability Derivatives	5.9	8.7
Commodity Contract
Derivatives, Fair Value [Line Items]
Netting of contracts in a receivable position against contracts in payable position	3.7	7.8
Commodity Contract \| Derivatives Designated as Hedging Instruments \| Balance Sheet Location [Axis]: us-gaap:AccruedLiabilitiesAndOtherLiabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	4.8	7.1
Commodity Contract \| Derivatives Designated as Hedging Instruments \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives, Fair Value [Line Items]
Asset Derivatives	3.7	6.2
Commodity Contract \| Derivatives Designated as Hedging Instruments \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivatives, Fair Value [Line Items]
Asset Derivatives	1.0	1.7
Commodity Contract \| Derivatives Designated as Hedging Instruments \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivatives, Fair Value [Line Items]
Liability Derivatives	1.1	$ 1.6
Other Contract
Derivatives, Fair Value [Line Items]
Netting of contracts in a receivable position against contracts in payable position	$ 1.0