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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - FINANCING ACTIVITIES - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Total Long-term Debt Outstanding | $ 42,642.8 | $ 40,143.2
Long-term Debt Due Within One Year | 3,335.0 | 2,490.5
Long-term Debt | 39,307.8 | 37,652.7
Parent Company |  |
Debt Instrument [Line Items] |  |
Senior Unsecured Notes | 5,290.0 | 5,265.0
Pollution Control Bonds | 536.8 | 537.8
Junior Subordinated Notes | 2,579.0 | 2,388.1
Total Long-term Debt Outstanding | 8,405.8 | 8,190.9
Long-term Debt Due Within One Year | 1,281.5 | 1,104.0
Long-term Debt | $ 7,124.3 | 7,086.9
Senior Unsecured Notes |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.32% |
Senior Unsecured Notes | $ 36,410.9 | $ 33,779.4
Senior Unsecured Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.00% | 1.00%
Senior Unsecured Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 8.13% | 8.13%
Senior Unsecured Notes | Parent Company |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.29% |
Senior Unsecured Notes | Parent Company | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.00% | 1.00%
Senior Unsecured Notes | Parent Company | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.95% | 5.95%
Pollution Control Bonds |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 3.26% |
Pollution Control Bonds | $ 1,771.3 | $ 1,771.6
Pollution Control Bonds | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.63% | 0.63%
Pollution Control Bonds | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.70% | 4.90%
Pollution Control Bonds | Parent Company |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 3.12% |
Pollution Control Bonds | Parent Company | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.40% | 1.90%
Pollution Control Bonds | Parent Company | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.75% | 2.60%
Junior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 5.67% |
Junior Subordinated Notes | $ 2,579.1 | $ 2,388.1
Junior Subordinated Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.88% | 2.03%
Junior Subordinated Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 7.05% | 5.70%
Junior Subordinated Notes | Parent Company |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 5.67% |
Junior Subordinated Notes | Parent Company | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.88% | 2.03%
Junior Subordinated Notes | Parent Company | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 7.05% | 5.70%

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