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Operations and Significant Accounting Policies - Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Fuel | $ 27.2 | $ 33.4
Materials and Supplies | 115.7 | 75.1
Renewable Energy Energy Facilities Under Development | 32.5 | 347.4
Total Inventories – Net | $ 175.4 | $ 455.9

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