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v3.26.1

FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Gains recorded in interest expense | $ (10.0) | $ (15.5) | $ (19.7) | $ (31.4) |
Carrying value of impaired asset | 7.6 | 38.1 | 7.6 | 38.1 |
Long-lived assets, fair value | 2.9 | 20.6 | 2.9 | 20.6 |
Impairment of long lived assets |  |  | 4.7 | 17.5 |
Customized Polymer Solutions |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Impairment of long lived assets |  |  | 4.7 | 1.0 |
Durable Metal Solutions |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Impairment of long lived assets |  |  |  | 2.1 |
Sustainable Fiber Solutions |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Impairment of long lived assets |  |  |  | 14.0 |
Innovative Closure Solutions |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Impairment of long lived assets |  |  |  | 0.2 |
Impairment of intangible assets, finite-lived |  |  |  | 0.2 |
Interest rate derivatives | Cash Flow Hedging |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | $ 320.0 |  | $ 320.0 |  | $ 562.5
Derivative, forward interest rate | 1.71% |  | 1.71% |  |
Gains reclassified to earnings | $ 1.8 | 4.8 | $ 3.8 | 11.0 |
Gain to be reclassified within next twelve months |  |  | 7.7 |  |
Foreign Currency Forward Contracts |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | 112.8 |  | 112.8 |  | 165.0
Gain (loss) recorded under fair value contracts | (0.2) | 0.8 | 0.1 | (1.1) |
Unrealized gains (losses) on foreign currency | 0.7 | (0.3) | (0.1) | (0.2) |
Cross currency swap |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | $ 534.9 |  | $ 534.9 |  | $ 534.9
Derivative, forward interest rate | 1.64% |  | 1.64% |  |
Gains recorded in interest expense | $ 2.2 | $ 1.7 | $ 4.4 | $ 3.2 |

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