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Commitments and Contingencies - Unconditional Purchase Obligations (Details) $ in Millions | Dec. 31, 2016 USD ($)
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Minimum future commitments for purchase obligations |
Total Amounts Committed | $ 11,977.5
2017 | 1,137.7
2018 | 921.8
2019 | 794.4
2020 | 701.1
2021 | 643.6
Later Years | 7,778.9
Nuclear | Electric |
Minimum future commitments for purchase obligations |
Total Amounts Committed | 9,599.8
2017 | 415.3
2018 | 420.1
2019 | 445.4
2020 | 475.1
2021 | 501.1
Later Years | 7,342.8
Purchased power | Electric |
Minimum future commitments for purchase obligations |
Total Amounts Committed | 693.3
2017 | 111.3
2018 | 75.9
2019 | 66.2
2020 | 66.3
2021 | 63.9
Later Years | 309.7
Coal supply and transportation | Electric |
Minimum future commitments for purchase obligations |
Total Amounts Committed | 455.0
2017 | 269.4
2018 | 140.3
2019 | 45.3
2020 | 0.0
2021 | 0.0
Later Years | 0.0
Natural gas utility supply and transportation | Natural gas |
Minimum future commitments for purchase obligations |
Total Amounts Committed | 1,229.4
2017 | 341.7
2018 | 285.5
2019 | 237.5
2020 | 159.7
2021 | 78.6
Later Years | $ 126.4

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=wec_NuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=wec_ElectricOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=wec_PurchasedPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=wec_CoalSupplyAndTransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=wec_NaturalGasSupplyAndTransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=wec_NaturalGasOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |