Name:	us-gaap_AssetAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Purchase price of expected asset acquisition prior to consideration being transferred.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 15
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6911878&loc=d3e8732-128492

Name:	us-gaap_AssetAcquisitionPriceOfAcquisitionExpected
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Additional ownership interest acquired in wind generating facility

No definition available.

Name:	wec_Additionalownershipinterestacquired
Namespace Prefix:	wec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The capacity, in megawatts, of a generation unit.

No definition available.

Name:	wec_CapacityOfGenerationUnit
Namespace Prefix:	wec_
Data Type:	dtr-types:powerItemType
Balance Type:	na
Period Type:	instant

Duration of offtake agreement for the sale of energy produced

No definition available.

Name:	wec_Durationofofftakeagreementforthesaleofenergyproduced
Namespace Prefix:	wec_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the ownership interest of the wind generating facility acquired

No definition available.