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DIVESTITURES - Depreciation, Amortization, and Capital Expenditures from Discontinued Operations (Details) - Discontinued Operations, Held-for-Sale - Greif Containerboard Solutions, LLC - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2025 | Mar. 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation and amortization | $ 9.3 | $ 18.3
Capital expenditures | $ 5.5 | $ 11.1

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