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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets:    
Derivative, Asset $ 15.3us-gaap_DerivativeAssets $ 11.8us-gaap_DerivativeAssets
Total 15.3wec_FairValueAssetsMeasuredOnRecurringBasisTotalAssets 11.8wec_FairValueAssetsMeasuredOnRecurringBasisTotalAssets
Liabilities:    
Derivative, Liability 12.5us-gaap_DerivativeLiabilities 0.3us-gaap_DerivativeLiabilities
Total 12.5wec_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities 0.3wec_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Derivative, Asset 1.1us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
5.7us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Total 1.1wec_FairValueAssetsMeasuredOnRecurringBasisTotalAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
5.7wec_FairValueAssetsMeasuredOnRecurringBasisTotalAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Liabilities:    
Derivative, Liability 11.5us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Total 11.5wec_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0wec_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Derivative, Asset 7.2us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
2.6us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Total 7.2wec_FairValueAssetsMeasuredOnRecurringBasisTotalAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
2.6wec_FairValueAssetsMeasuredOnRecurringBasisTotalAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Liabilities:    
Derivative, Liability 1.0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0.3us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Total 1.0wec_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0.3wec_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]    
Assets:    
Derivative, Asset 7.0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
3.5us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Total 7.0wec_FairValueAssetsMeasuredOnRecurringBasisTotalAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
3.5wec_FairValueAssetsMeasuredOnRecurringBasisTotalAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Liabilities:    
Derivative, Liability 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Total $ 0wec_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 0wec_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member