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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Derivative assets | $ 74.8 | $ 120.0
Liabilities |  |
Derivative liabilities | 96.6 | 15.1
Fair value measurements on a recurring basis |  |
Assets |  |
Derivative assets | 74.8 | 120.0
Investments held in rabbi trust | 50.9 | 79.6
Fair value measurements on a recurring basis | Level 1 |  |
Assets |  |
Derivative assets | 16.3 | 46.4
Investments held in rabbi trust | 50.9 | 79.6
Fair value measurements on a recurring basis | Level 2 |  |
Assets |  |
Derivative assets | 50.7 | 71.2
Investments held in rabbi trust | 0.0 | 0.0
Fair value measurements on a recurring basis | Level 3 |  |
Assets |  |
Derivative assets | 7.8 | 2.4
Investments held in rabbi trust | 0.0 | 0.0
Fair value measurements on a recurring basis | Natural gas contracts |  |
Assets |  |
Derivative assets | 32.5 | 64.6
Liabilities |  |
Derivative liabilities | 96.6 | 15.1
Fair value measurements on a recurring basis | Natural gas contracts | Level 1 |  |
Assets |  |
Derivative assets | 16.3 | 46.4
Liabilities |  |
Derivative liabilities | 81.4 | 8.4
Fair value measurements on a recurring basis | Natural gas contracts | Level 2 |  |
Assets |  |
Derivative assets | 16.2 | 18.2
Liabilities |  |
Derivative liabilities | 15.2 | 6.7
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 |  |
Assets |  |
Derivative assets | 7.8 | 2.4
Fair value measurements on a recurring basis | FTRs | Level 1 |  |
Assets |  |
Derivative assets | 0.0 | 0.0
Fair value measurements on a recurring basis | FTRs | Level 2 |  |
Assets |  |
Derivative assets | 0.0 | 0.0
Fair value measurements on a recurring basis | FTRs | Level 3 |  |
Assets |  |
Derivative assets | 7.8 | 2.4
Fair value measurements on a recurring basis | Coal contracts |  |
Assets |  |
Derivative assets | 34.5 | 53.0
Fair value measurements on a recurring basis | Coal contracts | Level 1 |  |
Assets |  |
Derivative assets | 0.0 | 0.0
Fair value measurements on a recurring basis | Coal contracts | Level 2 |  |
Assets |  |
Derivative assets | 34.5 | 53.0
Fair value measurements on a recurring basis | Coal contracts | Level 3 |  |
Assets |  |
Derivative assets | $ 0.0 | $ 0.0

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