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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | ---
Interest rate derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 17.5 | $ 22.1
Liabilities | 0.0 | 0.0
Foreign exchange hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.8 | 0.5
Liabilities | (0.9) | (0.6)
Insurance annuity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 20.0 | 20.3
Liabilities | 0.0 | 0.0
Cross currency swap |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 5.9 | 5.9
Liabilities | (40.0) | (51.0)
Level 1 | Interest rate derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | 0.0 | 0.0
Level 1 | Foreign exchange hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | 0.0 | 0.0
Level 1 | Insurance annuity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | 0.0 | 0.0
Level 1 | Cross currency swap |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | 0.0 | 0.0
Level 2 | Interest rate derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 17.5 | 22.1
Liabilities | 0.0 | 0.0
Level 2 | Foreign exchange hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.8 | 0.5
Liabilities | (0.9) | (0.6)
Level 2 | Insurance annuity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | 0.0 | 0.0
Level 2 | Cross currency swap |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 5.9 | 5.9
Liabilities | (40.0) | (51.0)
Level 3 | Interest rate derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | 0.0 | 0.0
Level 3 | Foreign exchange hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | 0.0 | 0.0
Level 3 | Insurance annuity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 20.0 | 20.3
Liabilities | 0.0 | 0.0
Level 3 | Cross currency swap |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | $ 0.0 | $ 0.0

X
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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