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%

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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