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PROPERTY, PLANT, AND EQUIPMENT - PGL IMPAIRMENT (Details) $ in Millions | 3 Months Ended
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Dec. 31, 2025 USD ($)
PGL |
Property, plant, and equipment |
Impairments related to Illinois segment | $ 130.0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
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Balance Type: | na
Period Type: | duration

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale) in our Illinois segment + References No definition available. + Details
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Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |