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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities: |  |  |
Depreciation and Amortization | $ 3,289.9 | $ 3,090.4 | $ 3,202.8
Deferred Income Taxes | 58.3 | 185.1 | (137.2)
Loss on the Expected Sale of the Kentucky Operations | 0.0 | 0.0 | 363.3
Change in Other Noncurrent Assets | (347.6) | (465.1) | (187.7)
Change in Other Noncurrent Liabilities | 306.3 | 29.0 | 337.8
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | (156.0) | 236.5 | (681.7)
Accounts Payable | 85.1 | (253.2) | 489.2
Other Current Assets | (13.2) | (43.9) | 109.0
Other Current Liabilities | 182.6 | (161.4) | 54.3
Net Cash Flows from Operating Activities | 6,804.3 | 5,012.2 | 5,288.0
INVESTING ACTIVITIES |  |  |
Construction Expenditures | (7,630.7) | (7,378.3) | (6,671.7)
Other Investing Activities | 141.9 | 122.1 | 50.3
Net Cash Flows Used for Investing Activities | (7,596.5) | (6,266.7) | (7,751.8)
FINANCING ACTIVITIES |  |  |
Issuance of Common Stock, Net | 552.1 | 999.6 | 826.5
Issuance of Long-term Debt | 5,117.0 | 5,462.8 | 4,649.7
Issuance of Short-term Debt with Original Maturities greater than 90 Days | 723.8 | 1,069.9 | 833.9
Change in Short-term Debt with Original Maturities less than 90 Day, Net | (159.1) | (1,223.1) | 1,650.4
Retirement of Long-term Debt | (2,685.0) | (2,196.1) | (2,345.4)
Redemption of Short-term Debt with Original Maturities greater than 90 Days | (871.1) | (1,128.8) | (986.1)
Dividends Paid on Common Stock | (1,903.9) | (1,760.4) | (1,645.2)
Other Financing Activities | (49.8) | (78.6) | (105.4)
Net Cash Flows from Financing Activities | 659.2 | 1,077.0 | 2,568.9
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | (133.0) | (177.5) | 105.1
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 379.0 | 556.5 | 451.4
Cash, Cash Equivalents and Restricted Cash at End of Period | 246.0 | 379.0 | 556.5
Parent Company |  |  |
OPERATING ACTIVITIES |  |  |
Net Income | 2,967.1 | 2,208.1 | 2,307.2
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities: |  |  |
Depreciation and Amortization | 0.6 | 0.5 | 0.4
Amortization of KPCo Basis Difference | (21.4) | (16.5) | 0.0
Deferred Income Taxes | (53.3) | 59.7 | (63.3)
Loss on the Expected Sale of the Kentucky Operations | 0.0 | 0.0 | 363.3
Equity Earnings of Unconsolidated Subsidiaries | (3,280.2) | (2,468.2) | (2,809.6)
Cash Dividends Received from Unconsolidated Subsidiaries | 1,143.4 | 686.3 | 603.9
Change in Other Noncurrent Assets | 4.9 | (28.4) | (5.0)
Change in Other Noncurrent Liabilities | 70.8 | 92.3 | 83.5
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | 17.9 | 28.7 | (61.0)
Accounts Payable | (16.5) | (15.9) | 1.1
Other Current Assets | 0.0 | (3.6) | (6.0)
Other Current Liabilities | 55.3 | (14.5) | (76.6)
Net Cash Flows from Operating Activities | 888.6 | 528.5 | 337.9
INVESTING ACTIVITIES |  |  |
Construction Expenditures | (0.6) | (0.8) | (0.7)
Change in Advances to Affiliates, Net | 59.9 | 2,007.6 | (1,411.3)
Capital Contributions to Unconsolidated Subsidiaries | (399.9) | (789.9) | (568.3)
Return of Capital Contributions from Unconsolidated Subsidiaries | 898.9 | 56.6 | 24.5
Issuance of Notes Receivable to Unconsolidated Subsidiaries | 0.0 | (210.0) | (20.0)
Repayment of Notes Receivable from Unconsolidated Subsidiaries | 190.0 | 0.0 | 0.0
Other Investing Activities | 0.0 | 0.0 | (0.2)
Net Cash Flows Used for Investing Activities | 748.3 | 1,063.5 | (1,976.0)
FINANCING ACTIVITIES |  |  |
Issuance of Common Stock, Net | 552.1 | 999.6 | 826.5
Issuance of Long-term Debt | 1,285.4 | 1,829.8 | 986.6
Issuance of Short-term Debt with Original Maturities greater than 90 Days | 723.8 | 1,069.9 | 833.9
Change in Short-term Debt with Original Maturities less than 90 Day, Net | (172.3) | (1,365.4) | 1,650.4
Retirement of Long-term Debt | (1,104.0) | (1,050.0) | (300.0)
Change in Advances from Affiliates, Net | (221.7) | (191.6) | 336.9
Redemption of Short-term Debt with Original Maturities greater than 90 Days | (871.1) | (1,128.8) | (986.1)
Dividends Paid on Common Stock | (1,898.3) | (1,752.3) | (1,628.7)
Other Financing Activities | (41.1) | (59.6) | (74.5)
Net Cash Flows from Financing Activities | (1,747.2) | (1,648.4) | 1,645.0
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | (110.3) | (56.4) | 6.9
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 197.8 | 254.2 | 247.3
Cash, Cash Equivalents and Restricted Cash at End of Period | $ 87.5 | $ 197.8 | $ 254.2

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