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COMMITMENTS AND CONTINGENCIES - Environmental Matters Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Site Contingency [Line Items] |  |
Reserve balance | $ 121.1 | $ 115.4
MGP Sites |  |
Site Contingency [Line Items] |  |
Reserve balance | $ 110.6 | $ 105.6

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