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Summary of Significant Accounting Policies Materials, Supplies, and Inventories (Details) $ in Millions | Dec. 31, 2024 USD ($) $ / MMBTU | Dec. 31, 2023 USD ($) $ / MMBTU
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Accounting Policies [Abstract] |  |
Materials and supplies | $ 412.5 | $ 320.0
Natural gas in storage | 300.2 | 327.8
Fossil fuel | 100.5 | 127.4
Total | $ 813.2 | $ 775.2
LIFO Method Related Items [Abstract] |  |
Percentage of LIFO inventory | 18.00% | 17.00%
Excess of replacement or current costs over stated LIFO value | $ 77.9 | $ 12.2
Natural gas price benchmark | $ / MMBTU | 3.10 | 2.13

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