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COMMITMENTS AND CONTINGENCIES - Environmental Matters Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Site Contingency [Line Items] |  |
Reserve balance | $ 130.5 | $ 128.2
MGP Sites |  |
Site Contingency [Line Items] |  |
Reserve balance | $ 117.9 | $ 117.1

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