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RISK MANAGEMENT ACTIVITIES - CASH COLLATERAL AND CREDIT-RISK RELATED CONTINGENT FEATURES (Details) (Utility segments, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Utility segments
   
Cash collateral    
Cash collateral provided to others, related to contracts under master netting or similar arrangements $ 11.6us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
$ 3.6us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Cash collateral provided to others, other 1.1teg_DerivativeCollateralRightToReclaimCashOther
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
1.1teg_DerivativeCollateralRightToReclaimCashOther
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Cash collateral received from others related to contracts under master netting or similar arrangements 0us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
0.7us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Credit-risk related contingent features    
Aggregate fair value of derivative instruments with credit risk-related contingent features that were is a liability position 31.3us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
0.6us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember
Collateral that would have been required $ 27.1us-gaap_AssetsNeededForImmediateSettlementAggregateFairValue
/ us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis
= us-gaap_RegulatedOperationMember