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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Derivative assets | $ 18.0 | $ 74.8
Liabilities |  |
Derivative liabilities | 106.4 | 96.6
Fair value measurements on a recurring basis |  |
Assets |  |
Derivative assets | 18.0 | 74.8
Investments held in rabbi trust | 51.7 | 50.9
Liabilities |  |
Derivative liabilities | 106.4 |
Fair value measurements on a recurring basis | Level 1 |  |
Assets |  |
Derivative assets | 2.2 | 16.3
Investments held in rabbi trust | 51.7 | 50.9
Liabilities |  |
Derivative liabilities | 70.1 |
Fair value measurements on a recurring basis | Level 2 |  |
Assets |  |
Derivative assets | 8.6 | 50.7
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 | 7.2 | 7.8
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 | 10.5 | 32.5
Liabilities |  |
Derivative liabilities | 86.1 | 96.6
Fair value measurements on a recurring basis | Natural gas contracts | Level 1 |  |
Assets |  |
Derivative assets | 2.2 | 16.3
Liabilities |  |
Derivative liabilities | 70.1 | 81.4
Fair value measurements on a recurring basis | Natural gas contracts | Level 2 |  |
Assets |  |
Derivative assets | 8.3 | 16.2
Liabilities |  |
Derivative liabilities | 16.0 | 15.2
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 | 7.2 | 7.8
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 | 7.2 | 7.8
Fair value measurements on a recurring basis | Coal contracts |  |
Assets |  |
Derivative assets | 0.3 | 34.5
Liabilities |  |
Derivative liabilities | 20.3 |
Fair value measurements on a recurring basis | Coal contracts | Level 1 |  |
Assets |  |
Derivative assets | 0.0 | 0.0
Liabilities |  |
Derivative liabilities | 0.0 |
Fair value measurements on a recurring basis | Coal contracts | Level 2 |  |
Assets |  |
Derivative assets | 0.3 | 34.5
Liabilities |  |
Derivative liabilities | 20.3 |
Fair value measurements on a recurring basis | Coal contracts | Level 3 |  |
Assets |  |
Derivative assets | 0.0 | $ 0.0
Liabilities |  |
Derivative liabilities | $ 0.0 |

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