XML 69 R58.htm IDEA: XBRL DOCUMENT
v3.7.0.1

VARIABLE INTEREST ENTITIES (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) MW | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Variable interest entities |  |  |
Equity investment in ATC | $ 1,513.3 |  | $ 1,443.9
ATC |  |  |
Variable interest entities |  |  |
Ownership interest in ATC (as a percent) | 60.00% |  |
Equity investment in ATC | $ 1,513.3 |  | 1,443.9
Accounts payable due to ATC | $ 29.1 |  | $ 28.7
Purchased power agreement |  |  |
Variable interest entities |  |  |
Firm capacity from purchased power agreement (in megawatts) | MW | 236 |  |
Minimum energy requirements over remaining term of purchased power agreement (in megawatts) | MW | 0 |  |
Remaining term of purchased power agreement (in years) | 5 years |  |
Residual guarantee associated with purchased power agreement | $ 0.0 |  |
Required payments over remaining term of purchased power agreement | 81.9 |  |
Total capacity and lease payments | $ 4.5 | $ 13.5 |

X
- Definition Amount for accounts payable to related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_EquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Under long-term contracts with public utility districts, cooperatives or other organizations, a utility company receives a portion of the output of a production plant constructed and financed by the district or cooperative. The utility has only a nominal or no investment at all in the plant but pays a proportionate part of the plant's costs, including debt service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.D) -URI http://asc.fasb.org/extlink&oid=6499423&loc=d3e659339-123030 + Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAmountOfLongTermDebtOrLeaseObligationOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

X
- Definition The remaining term, in years, of a purchased power agreement accounted for as a capital lease. + References No definition available. + Details
Name: | wec_RemainingTermOfCapitalLeasePurchasedPowerAgreement
Namespace Prefix: | wec_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the residual guarantee associated with a purchased power agreement accounted for as a capital lease. + References No definition available. + Details
Name: | wec_ResidualGuaranteeCapitalLeasePurchasedPowerAgreement
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total capacity and lease payments made under a purchased power agreement accounted for as a capital lease. + References No definition available. + Details
Name: | wec_TotalCapacityAndLeasePaymentsForCapitalLeasePurchasedPowerAgreement
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=wec_TransmissionAffiliateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=wec_PurchasedPowerAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |