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Summary of Significant Accounting Policies Materials, Supplies, and Inventories (Details) $ in Millions | Dec. 31, 2022 USD ($) $ / MMBTU | Dec. 31, 2021 USD ($) $ / MMBTU
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Accounting Policies [Abstract] |  |
Natural gas in storage | $ 446.3 | $ 326.0
Materials and supplies | 257.0 | 225.3
Fossil fuel | 103.8 | 84.5
Total | $ 807.1 | $ 635.8
LIFO Method Related Items [Abstract] |  |
Percentage of LIFO inventory | 13.00% | 19.00%
Excess of replacement or current costs over stated LIFO value | $ 98.3 | $ 114.2
Natural gas price benchmark | $ / MMBTU | 3.41 | 3.67

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