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Operations and Significant Accounting Policies - Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Fuel | $ 33.0 | $ 33.4
Materials and Supplies | 115.4 | 75.1
Renewable Energy Facilities Under Development | 31.9 | 347.4
Inventories – Net | $ 180.3 | $ 455.9

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