XML 66 R54.htm IDEA: XBRL DOCUMENT
v3.19.1

ACQUISITIONS ACQUISITIONS - COYOTE RIDGE (Details) - Coyote Ridge Wind $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) MW | Mar. 31, 2019 USD ($) Years
Business Acquisition [Line Items] |  |
WEC's ownership interest in Coyote Ridge Wind, LLC | 80.00% |
Capacity of Coyote Ridge | MW | 97.5 |
Acquisition purchase price | $ 61.6 |
Duration of offtake agreement for the sale of energy produced | 12 years |
Total expected investment |  | $ 145.0
Bonus depreciation percentage |  | 100.00%
Percent of tax benefits entitled to |  | 99.00%
Years Entitled to 99 Percent of Tax Benefits | Years |  | 11

X
- 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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Acquisition purchase price + References No definition available. + Details
Name: | wec_Acquisitionpurchaseprice
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Bonus depreciation percentage + References No definition available. + Details
Name: | wec_Bonusdepreciationpercentage
Namespace Prefix: | wec_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Capacity of Coyote Ridge + References No definition available. + Details
Name: | wec_CapacityofCoyoteRidge
Namespace Prefix: | wec_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Duration of offtake agreement for the sale of energy produced + References No definition available. + Details
Name: | wec_Durationofofftakeagreementforthesaleofenergyproduced
Namespace Prefix: | wec_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of tax benefits entitled to + References No definition available. + Details
Name: | wec_Percentoftaxbenefitsentitledto
Namespace Prefix: | wec_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total expected investment + References No definition available. + Details
Name: | wec_Totalexpectedinvestment
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition WEC's ownership interest in Coyote Ridge Wind, LLC + References No definition available. + Details
Name: | wec_WECsownershipinterestinCoyoteRidgeWindLLC
Namespace Prefix: | wec_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Years Entitled to 99 Percent of Tax Benefits from Coyote Ridge + References No definition available. + Details
Name: | wec_YearsEntitledto99PercentofTaxBenefits
Namespace Prefix: | wec_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=wec_CoyoteRidgeWindLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |