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RISK MANAGEMENT ACTIVITIES - NETTING ARRANGEMENTS (Details) (Utility segments, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Utility segments
   
Assets    
Derivative assets subject to master netting or similar arrangements, gross amount $ 3.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
$ 11.7us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Potential effects of netting, including cash collateral 1.3us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
2.1us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Derivative assets subject to master netting or similar arrangements, net amount 1.9teg_DerivativeFairValueOfDerivativeAssetSubjectToMasterNettingArrangementAmountOffsetAgainstCollateral
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
9.6teg_DerivativeFairValueOfDerivativeAssetSubjectToMasterNettingArrangementAmountOffsetAgainstCollateral
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Derivative assets not subject to master netting or similar arrangements 1.3us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
0.2us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Risk Management Assets 4.5us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
11.9us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Total Risk Management Assets, Net Amount 3.2us-gaap_DerivativeAssets
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
9.8us-gaap_DerivativeAssets
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Liabilities    
Derivative liabilities subject to master netting or similar arrangements, gross amount 45.7us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
1.4us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Potential effects of netting, including cash collateral 8.8us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
1.4us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Derivative liabilities subject to master netting or similar arrangements, net amount 36.9teg_DerivativeFairValueOfDerivativeLiabilitySubjectToMasterNettingArrangementAmountOffsetAgainstCollateral
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
0teg_DerivativeFairValueOfDerivativeLiabilitySubjectToMasterNettingArrangementAmountOffsetAgainstCollateral
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Derivative liabilities not subject to master netting or similar arrangements 3.4us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
2.7us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Risk Management Liabilities 49.1us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
4.1us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Total Risk Management Liabilities, Net Amount $ 40.3us-gaap_DerivativeLiabilities
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
$ 2.7us-gaap_DerivativeLiabilities
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember