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FAIR VALUE MEASUREMENTS - ASSETS AND LIABILITIES MEASURED ON A RECURRING BASIS (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Derivative assets | $ 30.3 | $ 18.0
Liabilities |  |
Derivative liabilities | 43.8 | 106.4
Fair value measurements on a recurring basis |  |
Assets |  |
Derivative assets | 30.3 | 18.0
Investments held in rabbi trust | 50.8 | 51.7
Liabilities |  |
Derivative liabilities |  | 106.4
Fair value measurements on a recurring basis | Level 1 |  |
Assets |  |
Derivative assets | 6.6 | 2.2
Investments held in rabbi trust | 50.8 | 51.7
Liabilities |  |
Derivative liabilities |  | 70.1
Fair value measurements on a recurring basis | Level 2 |  |
Assets |  |
Derivative assets | 11.7 | 8.6
Investments held in rabbi trust | 0.0 | 0.0
Liabilities |  |
Derivative liabilities |  | 36.3
Fair value measurements on a recurring basis | Level 3 |  |
Assets |  |
Derivative assets | 12.0 | 7.2
Investments held in rabbi trust | 0.0 | 0.0
Liabilities |  |
Derivative liabilities |  | 0.0
Fair value measurements on a recurring basis | Natural gas contracts |  |
Assets |  |
Derivative assets | 18.3 | 10.5
Liabilities |  |
Derivative liabilities | 43.8 | 86.1
Fair value measurements on a recurring basis | Natural gas contracts | Level 1 |  |
Assets |  |
Derivative assets | 6.6 | 2.2
Liabilities |  |
Derivative liabilities | 23.5 | 70.1
Fair value measurements on a recurring basis | Natural gas contracts | Level 2 |  |
Assets |  |
Derivative assets | 11.7 | 8.3
Liabilities |  |
Derivative liabilities | 20.3 | 16.0
Fair value measurements on a recurring basis | Natural gas contracts | Level 3 |  |
Assets |  |
Derivative assets | 0.0 | 0.0
Liabilities |  |
Derivative liabilities | 0.0 | 0.0
Fair value measurements on a recurring basis | FTRs and TCRs |  |
Assets |  |
Derivative assets | 12.0 | 7.2
Fair value measurements on a recurring basis | FTRs and TCRs | Level 1 |  |
Assets |  |
Derivative assets | 0.0 | 0.0
Fair value measurements on a recurring basis | FTRs and TCRs | Level 2 |  |
Assets |  |
Derivative assets | 0.0 | 0.0
Fair value measurements on a recurring basis | FTRs and TCRs | Level 3 |  |
Assets |  |
Derivative assets | $ 12.0 | 7.2
Fair value measurements on a recurring basis | Coal contracts |  |
Assets |  |
Derivative assets |  | 0.3
Liabilities |  |
Derivative liabilities |  | 20.3
Fair value measurements on a recurring basis | Coal contracts | Level 1 |  |
Assets |  |
Derivative assets |  | 0.0
Liabilities |  |
Derivative liabilities |  | 0.0
Fair value measurements on a recurring basis | Coal contracts | Level 2 |  |
Assets |  |
Derivative assets |  | 0.3
Liabilities |  |
Derivative liabilities |  | 20.3
Fair value measurements on a recurring basis | Coal contracts | Level 3 |  |
Assets |  |
Derivative assets |  | 0.0
Liabilities |  |
Derivative liabilities |  | $ 0.0

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