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ENVIRONMENTAL (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Environmental Remediation Obligations [Abstract] |  |  |  |  |
Reserves for future environmental expenditures - total | $ 155.3 | $ 151.8 | $ 155.3 | $ 151.8 | $ 153.6
Reserves for future environmental expenditures - noncurrent | 123.3 | 126.8 | 123.3 | 126.8 | $ 121.6
Environmental Remediation Expense | $ 6.4 | $ 13.0 | $ 12.2 | $ 16.2 |

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