XML 83 R71.htm IDEA: XBRL DOCUMENT
v3.19.1

LEASES - OBLIGATIONS UNDER FINANCE LEASE (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) MW | Dec. 31, 2009 USD ($)
Leases [Abstract] |  |
Power purchase contract period | 25 years |
Firm capacity from power purchase contract (in megawatts) | MW | 236 |
Minimum energy requirements over remaining term of power purchase contract (in megawatts) | MW | 0 |
Power purchase contract renewal period | 10 years |
Maximum regulatory asset for power purchase contract |  | $ 78.5
Regulatory asset at end of life of power purchase contract | $ 0.0 |
Finance lease obligation | 22.1 |
Finance lease obligation at end of life of power purchase contract | $ 0.0 |

X
- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The finance lease obligation for a power purchase contract remaining at the end of the life of the contract. + References No definition available. + Details
Name: | wec_FinanceLeaseObligationAtEndOfLifeOfPowerPurchaseContract
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Firm capacity, in megawatts, from a purchased power agreement accounted for as a finance lease. + References No definition available. + Details
Name: | wec_FirmCapacityFromFinanceLeasePurchasedPowerAgreement
Namespace Prefix: | wec_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum amount of a regulatory asset recorded for a power purchase contract accounted for as a finance lease. + References No definition available. + Details
Name: | wec_MaximumRegulatoryAssetForFinanceLeasePowerPurchaseContract
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The minimum energy requirements, in megawatts, over the remaining term of a purchased power agreement accounted for as a finance lease. + References No definition available. + Details
Name: | wec_MinimumEnergyRequirementsFinanceLeasePurchasedPowerAgreement
Namespace Prefix: | wec_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Power purchase contract expected future renewable period. + References No definition available. + Details
Name: | wec_PowerPurchaseContractExpectedFutureRenewablePeriod
Namespace Prefix: | wec_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Power purchase contract period. + References No definition available. + Details
Name: | wec_PowerPurchaseContractPeriod
Namespace Prefix: | wec_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory asset value at the end of life of contract. + References No definition available. + Details
Name: | wec_RegulatoryAssetValueAtEndOfLifeOfContract
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration