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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Mar. 31, 2026
Fair Value Disclosures [Abstract] |
Schedule of Recurring Fair Value Measurements | The following table presents the fair value for those assets and (liabilities) measured on a recurring basis as of March 31, 2026 and September 30, 2025:
| March 31, 2026
| Assets |  | Liabilities
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Interest rate derivatives | $ | — |  |  | $ | 17.5 |  |  | $ | — |  |  | $ | 17.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Foreign exchange hedges | — |  |  | 0.8 |  |  | — |  |  | 0.8 |  |  | — |  |  | (0.9) |  |  | — |  |  | (0.9) |
Insurance annuity | — |  |  | — |  |  | 20.0 |  |  | 20.0 |  |  | — |  |  | — |  |  | — |  |  | — |
Cross currency swap | — |  |  | 5.9 |  |  | — |  |  | 5.9 |  |  | — |  |  | (40.0) |  |  | — |  |  | (40.0) |
| September 30, 2025
| Assets |  | Liabilities
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Interest rate derivatives | $ | — |  |  | $ | 22.1 |  |  | $ | — |  |  | $ | 22.1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Foreign exchange hedges | — |  |  | 0.5 |  |  | — |  |  | 0.5 |  |  | — |  |  | (0.6) |  |  | — |  |  | (0.6) |
Insurance annuity | — |  |  | — |  |  | 20.3 |  |  | 20.3 |  |  | — |  |  | — |  |  | — |  |  | — |
Cross currency swap | — |  |  | 5.9 |  |  | — |  |  | 5.9 |  |  | — |  |  | (51.0) |  |  | — |  |  | (51.0) |
Schedule of Quantitative about Significant Unobservable Inputs Used to Determine Fair Value of Impairment of Long-Lived Assets Held and Used | The following table presents quantitative information about the significant unobservable inputs used to determine the fair value of the impairment of long-lived assets held and used and net assets held for sale for the six months ended March 31, 2026 and 2025:
| Quantitative Information about Level 3 Fair Value Measurements
(in millions) | Impairment Amount |  | Valuation Technique |  | Unobservable Input |  | Range of Input Values
March 31, 2026 |  |  |  |  |  |  |
Long Lived Assets | $ | 4.7 |  |  | Discounted Cash Flows; Indicative Bids |  | Discounted Cash Flows; Indicative Bids |  | N/A
Total | $ | 4.7 |  |  |  |  |  |  |
March 31, 2025 |  |  |  |  |  |  |
Long Lived Assets | $ | 17.5 |  |  | Discounted Cash Flows; Indicative Bids |  | Discounted Cash Flows; Indicative Bids |  | N/A
Total | $ | 17.5 |  |  |  |  |  |  |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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