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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123362884&loc=d3e9212-128498

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123362884&loc=d3e9215-128498

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123385561&loc=d3e9135-128495

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Additional acquisition purchase price

No definition available.

Name:	wec_AdditionalAcquisitionPurchasePrice
Namespace Prefix:	wec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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 generating facility acquired

No definition available.