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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Fair Values of the Company's Derivative Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives instruments | $ 13.5 | $ (22.2)
Designated as Hedging Instruments | Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives instruments | 9.0 | (19.9)
Designated as Hedging Instruments | Interest rate swap agreements | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset | 3.3 | 0.0
Designated as Hedging Instruments | Interest rate swap agreements | Other current liabilities | Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability | (5.7) | (10.4)
Designated as Hedging Instruments | Interest rate swap agreements | Other liabilities | Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability | (2.5) | (9.7)
Designated as Hedging Instruments | Commodity hedging instruments | Prepaid and other current assets | Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset | 13.9 | 0.9
Designated as Hedging Instruments | Commodity hedging instruments | Other current liabilities | Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability | 0.0 | (0.7)
Derivatives not designated as Hedging Instruments | Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives instruments | 4.5 | (2.3)
Derivatives not designated as Hedging Instruments | Commodity hedging instruments | Prepaid and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset | 1.3 | 0.0
Derivatives not designated as Hedging Instruments | Commodity hedging instruments | Other current liabilities | Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability |  | (0.9)
Derivatives not designated as Hedging Instruments | Currency forward contracts | Prepaid and other current assets | Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset | 3.4 | 0.5
Derivatives not designated as Hedging Instruments | Currency forward contracts | Other current liabilities | Fair value, inputs, level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability | $ (0.2) | $ (1.9)

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