Discloses the amount of any reduction to the carrying amounts of regulated assets that result from impairment (for example, rate actions of a regulator).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 35
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6066304&loc=d3e44026-110379

+ Details

Name:	us-gaap_AmountOfImpairmentToCarryingAmountOfRegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

- Definition

Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

+ Details

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

+ References

+ Details

Name:	us-gaap_RegulatoryAssetsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

+ References

+ Details

Name:	us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of utilities filing a joint proposal

+ References

No definition available.

+ Details

Name:	wec_NumberOfUtilitiesFilingAJointProposal
Namespace Prefix:	wec_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_RegulatoryAssetAxis=wec_EnergyCostsRecoverableThroughRateAdjustmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAssetAxis=us-gaap_AssetRecoverableGasCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=wec_WisconsinElectricPowerCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAgencyAxis=wec_PublicServiceCommissionOfWisconsinPSCWMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=wec_WisconsinGasLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=wec_WisconsinPublicServiceCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=wec_ThePeoplesGasLightAndCokeCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAgencyAxis=wec_IllinoisCommerceCommissionICCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=wec_NSGMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=wec_MinnesotaEnergyResourcesCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAgencyAxis=wec_MinnesotaPublicUtilitiesCommissionMPUCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

REGULATORY ENVIRONMENT - RECOVERY OF NATURAL GAS COSTS (Details) $ in Millions	1 Months Ended
	Aug. 31, 2021 USD ($) utility	Mar. 31, 2021 USD ($)	Feb. 28, 2021 USD ($)	Oct. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items]
Amounts recoverable from customers					$ 87.0	$ 102.3
Total regulatory assets					3,251.2	3,367.1
Regulatory assets					3,164.2	3,264.8
Energy costs recoverable through rate adjustments
Public Utilities, General Disclosures [Line Items]
Total regulatory assets					73.5	85.4
MERC extraordinary natural gas costs
Public Utilities, General Disclosures [Line Items]
Total regulatory assets					$ 44.9	$ 59.7
WE \| Public Service Commission of Wisconsin (PSCW) \| Energy costs recoverable through rate adjustments
Public Utilities, General Disclosures [Line Items]
Amounts recoverable from customers		$ 54.0
Recovery period of regulatory asset		3 months
WG \| Public Service Commission of Wisconsin (PSCW) \| Energy costs recoverable through rate adjustments
Public Utilities, General Disclosures [Line Items]
Amounts recoverable from customers		$ 24.0
Recovery period of regulatory asset		3 months
WPS \| Public Service Commission of Wisconsin (PSCW) \| Energy costs recoverable through rate adjustments
Public Utilities, General Disclosures [Line Items]
Amounts recoverable from customers		$ 28.0
Recovery period of regulatory asset		3 months
PGL \| Illinois Commerce Commission (ICC) \| Energy costs recoverable through rate adjustments
Public Utilities, General Disclosures [Line Items]
Amounts recoverable from customers			$ 131.0
Recovery period of regulatory asset			12 months
NSG \| Illinois Commerce Commission (ICC) \| Energy costs recoverable through rate adjustments
Public Utilities, General Disclosures [Line Items]
Amounts recoverable from customers			$ 10.0
Recovery period of regulatory asset			12 months
MERC \| Minnesota Public Utilities Commission (MPUC)
Public Utilities, General Disclosures [Line Items]
Number of utilities filing a joint proposal \| utility	4
MERC \| Minnesota Public Utilities Commission (MPUC) \| Energy costs recoverable through rate adjustments
Public Utilities, General Disclosures [Line Items]
Amounts recoverable from customers	$ 10.0
Recovery period of regulatory asset	12 months
Total regulatory assets			$ 75.0
MERC \| Minnesota Public Utilities Commission (MPUC) \| MERC extraordinary natural gas costs
Public Utilities, General Disclosures [Line Items]
Recovery period of regulatory asset	27 months
Regulatory assets	$ 65.0
MERC \| Minnesota Public Utilities Commission (MPUC) \| MERC extraordinary natural gas costs \| Subsequent event
Public Utilities, General Disclosures [Line Items]
Regulatory assets				$ 62.0
Natural gas costs not recovered				$ 3.0