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Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Inventory Disclosure [Abstract] |  |
Coal | $ 127.8 | $ 109.4
Coke | 21.5 | 14.3
Materials, supplies and other | 57.5 | 51.5
Total inventories | $ 206.8 | $ 175.2

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