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SIGNIFICANT ACCOUNTING MATTERS - Supplementary Cash Flow Information (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Cash Paid (Received) for: |  |
Interest, Net of Capitalized Amounts | $ 1,315.1 | $ 1,247.3
Income Taxes, Net | 60.1 | 87.9
Sale of Transferable Tax Credits | (102.2) | (163.7)
Noncash Investing and Financing Activities: |  |
Acquisitions Under Finance Leases | 30.0 | 24.5
Construction Expenditures Included in Current Liabilities as of September 30, | 1,168.8 | 1,015.1
Acquisition of Nuclear Fuel Included in Current Liabilities as of September 30, | $ 1.4 | $ 8.2

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