XML 65 R54.htm IDEA: XBRL DOCUMENT
v3.10.0.1

ACQUISITIONS - UPSTREAM ACQUISITION (Details) - Upstream $ in Millions | 1 Months Ended
--- | ---
Apr. 30, 2018 USD ($) MW
Business Acquisition [Line Items] |
WEC's ownership interest in Upstream Wind Energy Center | 80.00%
Capacity of Upstream Wind Energy Center | MW | 202.5
Acquisition purchase price | $ | $ 276.0
Number of years Upstream will receive fixed payment | 10 years
Bonus depreciation percentage | 100.00%

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 Upstream Wind Energy Center + References No definition available. + Details
Name: | wec_CapacityofUpstreamWindEnergyCenter
Namespace Prefix: | wec_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of years during which Upstream Wind Energy Center will receive a fixed payment in exchange for substantially all its energy output per energy swap agreement + References No definition available. + Details
Name: | wec_NumberofyearsUpstreamwillreceivefixedpayment
Namespace Prefix: | wec_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition WEC's ownership interest in Upstream Wind Energy Center + References No definition available. + Details
Name: | wec_WECsownershipinterestinUpstreamWindEnergyCenter
Namespace Prefix: | wec_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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