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ENVIRONMENTAL (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Environmental Remediation Obligations [Abstract] |  |  |  |  |
Reserves for future environmental expenditures - total | $ 155.2 | $ 155.3 | $ 155.2 | $ 155.3 | $ 156.5
Reserves for future environmental expenditures - noncurrent | 125.2 | 123.3 | 125.2 | 123.3 | $ 126.5
Environmental Remediation Expense | $ 4.8 | $ 6.4 | $ 9.8 | $ 12.2 |

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