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MATERIALS, SUPPLIES, AND INVENTORIES (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Energy Related Inventory |  |
Materials and supplies | $ 283.7 | $ 257.0
Natural gas in storage | 212.1 | 446.3
Fossil fuel | 107.9 | 103.8
Total | 603.7 | $ 807.1
LIFO Method Related Items |  |
LIFO liquidation balance | $ 2.1 |

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