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MATERIALS, SUPPLIES, AND INVENTORIES (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Energy Related Inventory |  |
Materials and supplies | $ 395.6 | $ 412.5
Natural gas in storage | 358.4 | 300.2
Fossil fuel | 88.8 | 100.5
Total | 842.8 | $ 813.2
LIFO Method Related Items |  |
LIFO liquidation debit | $ 0.0 |

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- Definition Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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