PROPERTY, PLANT AND EQUIPMENT (Details) $ in Millions	9 Months Ended
Sep. 30, 2025 USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO as of December 31, 2024	$ 3,611.7
Accretion Expense	127.4
Liabilities Incurred	21.2
Liabilities Settled	(68.3)
Revisions in Cash Flow Estimates	36.2
ARO as of September 30, 2025	3,728.2
PSO
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO as of December 31, 2024	121.8
Accretion Expense	5.7
Liabilities Incurred	19.3
Liabilities Settled	(1.9)
Revisions in Cash Flow Estimates	(2.8)
ARO as of September 30, 2025	142.1
SWEPCo
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO as of December 31, 2024	278.7
Accretion Expense	12.7
Liabilities Incurred	0.0
Liabilities Settled	(42.4)
Revisions in Cash Flow Estimates	33.0
ARO as of September 30, 2025	$ 282.0

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481999/410-20-25-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481879/410-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (i)
-Publisher FASB
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Amount of asset retirement obligations incurred during the period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(4)
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-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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