XML 46 R33.htm IDEA: XBRL DOCUMENT
v3.8.0.1

DERIVATIVE INSTRUMENTS (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative assets and derivative liabilities | The following table shows our derivative assets and derivative liabilities:
|  | September 30, 2017 |  | December 31, 2016
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Other current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 5.4 |  |  | $ | 4.0 |  |  | $ | 31.4 |  |  | $ | 0.4 |
Petroleum products contracts |  | 1.0 |  |  | — |  |  | 0.2 |  |  | 0.1 |
FTRs |  | 7.3 |  |  | — |  |  | 5.1 |  |  | — |
Coal contracts |  | 0.6 |  |  | 1.4 |  |  | 1.5 |  |  | 1.4 |
Total other current * |  | $ | 14.3 |  |  | $ | 5.4 |  |  | $ | 38.2 |  |  | $ | 1.9 |
Other long-term |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 1.1 |  |  | $ | — |  |  | $ | 2.9 |  |  | $ | — |
Coal contracts |  | 0.3 |  |  | 0.7 |  |  | 0.5 |  |  | 0.5 |
Total other long-term * |  | $ | 1.4 |  |  | $ | 0.7 |  |  | $ | 3.4 |  |  | $ | 0.5 |
Total |  | $ | 15.7 |  |  | $ | 6.1 |  |  | $ | 41.6 |  |  | $ | 2.4 |
* | On our balance sheets, we classify derivative assets and liabilities as other current or other long-term based on the maturities of the underlying contracts.
Estimated notional volumes and realized gain (losses) | Our estimated notional sales volumes and realized gains (losses) were as follows:
|  | Three Months Ended September 30, 2017 |  | Three Months Ended September 30, 2016
(in millions) |  | Volumes |  | Gains (Losses) |  | Volumes |  | Gains (Losses)
Natural gas contracts |  | 24.9 Dth |  | $ | (2.1 | ) |  | 30.5 Dth |  | $ | (3.4 | )
Petroleum products contracts |  | 4.4 gallons |  | (0.5 | ) |  | 4.3 gallons |  | (0.4 | )
FTRs |  | 9.4 MWh |  | 4.2 |  |  | 9.9 MWh |  | 7.1 |
Total |  |  |  | $ | 1.6 |  |  |  |  | $ | 3.3 |
|  | Nine Months Ended September 30, 2017 |  | Nine Months Ended September 30, 2016
(in millions) |  | Volumes |  | Gains (Losses) |  | Volumes |  | Gains (Losses)
Natural gas contracts |  | 84.2 Dth |  | $ | (1.1 | ) |  | 113.3 Dth |  | $ | (56.9 | )
Petroleum products contracts |  | 14.2 gallons |  | (1.4 | ) |  | 10.9 gallons |  | (2.5 | )
FTRs |  | 28.0 MWh |  | 9.4 |  |  | 24.9 MWh |  | 11.7 |
Total |  |  |  | $ | 6.9 |  |  |  |  | $ | (47.7 | )
Offsetting assets and liabilities | The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:
|  | September 30, 2017 |  | December 31, 2016
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Gross amount recognized on the balance sheet |  | $ | 15.7 |  |  | $ | 6.1 |  |  | $ | 41.6 |  |  | $ | 2.4 |
Gross amount not offset on the balance sheet |  | (3.0 | ) |  | (3.1 | ) | (1) | (4.9 | ) | (2) | (0.5 | )
Net amount |  | $ | 12.7 |  |  | $ | 3.0 |  |  | $ | 36.7 |  |  | $ | 1.9 |
(1) | Includes cash collateral posted of $0.1 million.
(2) | Includes cash collateral received of $4.4 million.

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

X
- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
Name: | us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amount of the realized gain (loss) and notional volumes for derivative instruments not designated as hedging instruments. + References No definition available. + Details
Name: | wec_DerivativeInstrumentsRealizedGainLossandNotionalVolumesTableTextBlock
Namespace Prefix: | wec_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Offsetting Assets and Liabilities [Table Text Block] + References No definition available. + Details
Name: | wec_OffsettingAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | wec_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration