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Regulatory Environment - MGU (Details) $ in Millions | Jul. 01, 2020 USD ($)
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MPSC | MGU |
Public Utilities, General Disclosures [Line Items] |
Depreciation and interest expense approved for deferral | $ 5.0

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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 No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of depreciation and interest expense approved for deferral in 2021. + References No definition available. + Details
Name: | wec_DepreciationAndInterestExpenseApprovedForDeferral
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RegulatoryAgencyAxis=wec_MichiganPublicServiceCommissionMPSCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=wec_MGUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |