FAIR VALUE MEASUREMENTS - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	$ 258.5	$ 263.2
Risk Management Assets
Total Risk Management Assets	499.5	538.7
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	4,395.1	3,860.2
Total Assets	5,153.1	4,662.1
Risk Management Liabilities
Total Risk Management Liabilities	324.4	471.4
AEP TEXAS INC.
Other Temporary Investments and Restricted Cash
Restricted Cash	23.5	34.0
Risk Management Assets
Total Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	2.7
APPALACHIAN POWER COMPANY
Other Temporary Investments and Restricted Cash
Restricted Cash	16.2	14.9
Risk Management Assets
Total Risk Management Assets	37.1	22.4
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	53.3	37.3
Risk Management Liabilities
Total Risk Management Liabilities	2.2	22.5
INDIANA MICHIGAN POWER COMPANY
Risk Management Assets
Total Risk Management Assets	18.4	39.6
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	4,395.1	3,860.2
Total Assets	4,413.5	3,899.8
Risk Management Liabilities
Total Risk Management Liabilities	0.7	2.0
OHIO POWER COMPANY
Risk Management Assets
Total Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	47.5	50.7
PUBLIC SERVICE COMPANY OF OKLAHOMA
Risk Management Assets
Total Risk Management Assets	22.0	19.0
Risk Management Liabilities
Total Risk Management Liabilities	5.8	29.9
SOUTHWESTERN ELECTRIC POWER COMPANY
Other Temporary Investments and Restricted Cash
Restricted Cash	3.4
Risk Management Assets
Total Risk Management Assets	18.1	11.6
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	21.5
Risk Management Liabilities
Total Risk Management Liabilities	2.3	15.6
Risk Management Commodity Contracts
Risk Management Assets
Total Risk Management Assets	374.6	403.9
Risk Management Liabilities
Total Risk Management Liabilities	252.6	362.3
Risk Management Commodity Contracts \| AEP TEXAS INC.
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Risk Management Commodity Contracts \| APPALACHIAN POWER COMPANY
Risk Management Assets
Total Risk Management Assets	37.1	22.4
Risk Management Liabilities
Total Risk Management Liabilities	2.2	22.5
Risk Management Commodity Contracts \| INDIANA MICHIGAN POWER COMPANY
Risk Management Assets
Total Risk Management Assets	18.4	39.6
Risk Management Liabilities
Total Risk Management Liabilities	0.7	2.0
Risk Management Commodity Contracts \| OHIO POWER COMPANY
Risk Management Liabilities
Total Risk Management Liabilities	47.5	50.7
Risk Management Commodity Contracts \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Risk Management Assets
Total Risk Management Assets	22.0	19.0
Risk Management Liabilities
Total Risk Management Liabilities	5.8	29.9
Risk Management Commodity Contracts \| SOUTHWESTERN ELECTRIC POWER COMPANY
Risk Management Assets
Total Risk Management Assets	18.1	11.6
Risk Management Liabilities
Total Risk Management Liabilities	2.3	15.6
Commodity Hedges
Risk Management Assets
Total Risk Management Assets	124.9	134.8
Risk Management Liabilities
Total Risk Management Liabilities	0.2	1.7
Interest Rate Hedges
Risk Management Liabilities
Total Risk Management Liabilities		9.0
Interest Rate Hedges \| AEP TEXAS INC.
Risk Management Liabilities
Total Risk Management Liabilities		2.7
Fair Value Hedges
Risk Management Liabilities
Total Risk Management Liabilities	71.6	98.4
Other
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	13.9	13.9
Risk Management Assets
Total Risk Management Assets	(529.8)	(625.5)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13.7	9.0
Total Assets	(502.2)	(602.6)
Risk Management Liabilities
Total Risk Management Liabilities	(446.2)
Total Risk Management Liabilities		(608.8)
Other \| AEP TEXAS INC.
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities		(0.2)
Other \| APPALACHIAN POWER COMPANY
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(4.6)	(2.2)
Other \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13.7	9.0
Total Assets	5.3	6.7
Other \| SOUTHWESTERN ELECTRIC POWER COMPANY
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(1.0)
Other \| Risk Management Commodity Contracts
Risk Management Assets
Total Risk Management Assets	(517.2)	(617.0)
Risk Management Liabilities
Total Risk Management Liabilities	(433.6)
Total Risk Management Liabilities		(600.3)
Other \| Risk Management Commodity Contracts \| AEP TEXAS INC.
Risk Management Liabilities
Total Risk Management Liabilities	(0.3)	(0.2)
Other \| Risk Management Commodity Contracts \| APPALACHIAN POWER COMPANY
Risk Management Assets
Total Risk Management Assets	(4.6)	(2.2)
Risk Management Liabilities
Total Risk Management Liabilities	(4.7)	(2.6)
Other \| Risk Management Commodity Contracts \| INDIANA MICHIGAN POWER COMPANY
Risk Management Assets
Total Risk Management Assets	(8.4)	(2.3)
Risk Management Liabilities
Total Risk Management Liabilities	(9.0)	(3.4)
Other \| Risk Management Commodity Contracts \| OHIO POWER COMPANY
Risk Management Liabilities
Total Risk Management Liabilities	(0.2)	(0.1)
Other \| Risk Management Commodity Contracts \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Risk Management Assets
Total Risk Management Assets	(1.9)	(0.7)
Risk Management Liabilities
Total Risk Management Liabilities	(2.0)	(0.8)
Other \| Risk Management Commodity Contracts \| SOUTHWESTERN ELECTRIC POWER COMPANY
Risk Management Assets
Total Risk Management Assets	(1.0)	(0.9)
Risk Management Liabilities
Total Risk Management Liabilities	(1.1)	(1.0)
Other \| Commodity Hedges
Risk Management Assets
Total Risk Management Assets	(12.6)	(8.5)
Risk Management Liabilities
Total Risk Management Liabilities	(12.6)
Total Risk Management Liabilities		(8.5)
Other \| Interest Rate Hedges
Risk Management Liabilities
Total Risk Management Liabilities		0.0
Other \| Interest Rate Hedges \| AEP TEXAS INC.
Risk Management Liabilities
Total Risk Management Liabilities		0.0
Other \| Fair Value Hedges
Risk Management Liabilities
Total Risk Management Liabilities	0.0
Total Risk Management Liabilities		0.0
Restricted Cash
Other Temporary Investments and Restricted Cash
Restricted Cash	43.1	48.9
Restricted Cash \| Other
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Other Cash Deposits
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	13.9	13.9
Other Cash Deposits \| Other
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	13.9	13.9
Fixed Income Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	161.9	159.7
Fixed Income Securities – Mutual Funds \| Other
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Equity Securities - Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	39.6	40.7
Equity Securities - Mutual Funds \| Other
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Cash and Cash Equivalents
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	23.3	16.8
Cash and Cash Equivalents \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	23.3	16.8
Cash and Cash Equivalents \| Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13.7	9.0
Cash and Cash Equivalents \| Other \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13.7	9.0
United States Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,322.8	1,273.0
United States Government \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,322.8	1,273.0
United States Government \| Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
United States Government \| Other \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Corporate Debt
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	211.3	132.1
Corporate Debt \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	211.3	132.1
Corporate Debt \| Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Corporate Debt \| Other \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
State and Local Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	1.7
State and Local Government \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	1.7
State and Local Government \| Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
State and Local Government \| Other \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Subtotal Fixed Income Securities
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,534.1	1,406.8
Subtotal Fixed Income Securities \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,534.1	1,406.8
Subtotal Fixed Income Securities \| Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Subtotal Fixed Income Securities \| Other \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Equity Securities - Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,837.7	2,436.6
Equity Securities - Domestic \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,837.7	2,436.6
Equity Securities - Domestic \| Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Equity Securities - Domestic \| Other \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	244.6	249.3
Risk Management Assets
Total Risk Management Assets	2.9	9.7
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,847.3	2,444.4
Total Assets	3,094.8	2,703.4
Risk Management Liabilities
Total Risk Management Liabilities	4.4	24.7
Level 1 \| 2025
Risk Management Liabilities
Maturities of net fair value of risk management contracts	(1.0)
Level 1 \| 2024
Risk Management Liabilities
Maturities of net fair value of risk management contracts		(11.0)
Level 1 \| 2025 - 2027
Risk Management Liabilities
Maturities of net fair value of risk management contracts		(4.0)
Level 1 \| AEP TEXAS INC.
Other Temporary Investments and Restricted Cash
Restricted Cash	23.5	34.0
Risk Management Liabilities
Total Risk Management Liabilities		0.0
Level 1 \| APPALACHIAN POWER COMPANY
Other Temporary Investments and Restricted Cash
Restricted Cash	16.2	14.9
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	16.2	14.9
Level 1 \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,847.3	2,444.4
Total Assets	2,847.3	2,444.4
Level 1 \| SOUTHWESTERN ELECTRIC POWER COMPANY
Other Temporary Investments and Restricted Cash
Restricted Cash	3.4
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		3.4
Level 1 \| Risk Management Commodity Contracts
Risk Management Assets
Total Risk Management Assets	2.9	9.7
Risk Management Liabilities
Total Risk Management Liabilities	4.4	24.7
Level 1 \| Risk Management Commodity Contracts \| AEP TEXAS INC.
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 \| Risk Management Commodity Contracts \| APPALACHIAN POWER COMPANY
Risk Management Assets
Total Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 \| Risk Management Commodity Contracts \| INDIANA MICHIGAN POWER COMPANY
Risk Management Assets
Total Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 \| Risk Management Commodity Contracts \| OHIO POWER COMPANY
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 \| Risk Management Commodity Contracts \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Risk Management Assets
Total Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 \| Risk Management Commodity Contracts \| SOUTHWESTERN ELECTRIC POWER COMPANY
Risk Management Assets
Total Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 \| Commodity Hedges
Risk Management Assets
Total Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 \| Interest Rate Hedges
Risk Management Liabilities
Total Risk Management Liabilities		0.0
Level 1 \| Interest Rate Hedges \| AEP TEXAS INC.
Risk Management Liabilities
Total Risk Management Liabilities		0.0
Level 1 \| Fair Value Hedges
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 \| Restricted Cash
Other Temporary Investments and Restricted Cash
Restricted Cash	43.1	48.9
Level 1 \| Other Cash Deposits
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Level 1 \| Fixed Income Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	161.9	159.7
Level 1 \| Equity Securities - Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	39.6	40.7
Level 1 \| Cash and Cash Equivalents
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	9.6	7.8
Level 1 \| Cash and Cash Equivalents \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	9.6	7.8
Level 1 \| United States Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 \| United States Government \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 \| Corporate Debt
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 \| Corporate Debt \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 \| State and Local Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 \| State and Local Government \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 \| Subtotal Fixed Income Securities
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 \| Subtotal Fixed Income Securities \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 \| Equity Securities - Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,837.7	2,436.6
Level 1 \| Equity Securities - Domestic \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,837.7	2,436.6
Level 2
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Risk Management Assets
Total Risk Management Assets	712.9	860.4
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,534.1	1,406.8
Total Assets	2,247.0	2,267.2
Risk Management Liabilities
Total Risk Management Liabilities	618.3	900.8
Level 2 \| 2025
Risk Management Liabilities
Maturities of net fair value of risk management contracts	16.0
Level 2 \| 2026 - 2028
Risk Management Liabilities
Maturities of net fair value of risk management contracts	43.0
Level 2 \| 2029-2030
Risk Management Liabilities
Maturities of net fair value of risk management contracts	4.0
Level 2 \| 2024
Risk Management Liabilities
Maturities of net fair value of risk management contracts		(99.0)
Level 2 \| 2025 - 2027
Risk Management Liabilities
Maturities of net fair value of risk management contracts		(44.0)
Level 2 \| 2028 - 2029
Risk Management Liabilities
Maturities of net fair value of risk management contracts		7.0
Level 2 \| 2030 - 2033
Risk Management Liabilities
Maturities of net fair value of risk management contracts		2.0
Level 2 \| AEP TEXAS INC.
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities		2.9
Level 2 \| APPALACHIAN POWER COMPANY
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	6.5	1.1
Level 2 \| INDIANA MICHIGAN POWER COMPANY
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,534.1	1,406.8
Total Assets	1,554.0	1,444.2
Level 2 \| SOUTHWESTERN ELECTRIC POWER COMPANY
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	1.0
Level 2 \| Risk Management Commodity Contracts
Risk Management Assets
Total Risk Management Assets	597.3	736.9
Risk Management Liabilities
Total Risk Management Liabilities	534.1	783.8
Level 2 \| Risk Management Commodity Contracts \| AEP TEXAS INC.
Risk Management Liabilities
Total Risk Management Liabilities	0.3	0.2
Level 2 \| Risk Management Commodity Contracts \| APPALACHIAN POWER COMPANY
Risk Management Assets
Total Risk Management Assets	6.5	1.1
Risk Management Liabilities
Total Risk Management Liabilities	6.9	24.0
Level 2 \| Risk Management Commodity Contracts \| INDIANA MICHIGAN POWER COMPANY
Risk Management Assets
Total Risk Management Assets	19.9	37.4
Risk Management Liabilities
Total Risk Management Liabilities	9.2	3.7
Level 2 \| Risk Management Commodity Contracts \| OHIO POWER COMPANY
Risk Management Liabilities
Total Risk Management Liabilities	0.2	0.2
Level 2 \| Risk Management Commodity Contracts \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Risk Management Assets
Total Risk Management Assets	3.1	0.0
Risk Management Liabilities
Total Risk Management Liabilities	7.0	29.6
Level 2 \| Risk Management Commodity Contracts \| SOUTHWESTERN ELECTRIC POWER COMPANY
Risk Management Assets
Total Risk Management Assets	1.0	0.5
Risk Management Liabilities
Total Risk Management Liabilities	2.8	15.7
Level 2 \| Commodity Hedges
Risk Management Assets
Total Risk Management Assets	115.6	123.5
Risk Management Liabilities
Total Risk Management Liabilities	12.6	9.6
Level 2 \| Interest Rate Hedges
Risk Management Liabilities
Total Risk Management Liabilities		9.0
Level 2 \| Interest Rate Hedges \| AEP TEXAS INC.
Risk Management Liabilities
Total Risk Management Liabilities		2.7
Level 2 \| Fair Value Hedges
Risk Management Liabilities
Total Risk Management Liabilities	71.6	98.4
Level 2 \| Restricted Cash
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0

FAIR VALUE MEASUREMENTS - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($)
$ in Millions

Dec. 31, 2024

Dec. 31, 2023

Other Temporary Investments and Restricted Cash

Total Other Temporary Investments and Restricted Cash

$ 258.5

$ 263.2

Risk Management Assets

Total Risk Management Assets

499.5

538.7

Spent Nuclear Fuel and Decommissioning Trusts