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Operations and Significant Accounting Policies - Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Fuel | $ 30.2 | $ 27.2
Materials and Supplies | 119.0 | 115.7
Renewable Energy Facilities Under Development | 33.5 | 32.5
Inventories – Net | $ 182.7 | $ 175.4

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