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DISPOSITIONS - DISPOSITIONS EXCLUDING DISCONTINUED OPERATIONS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Nov. 30, 2014
Aug. 31, 2014
Nov. 01, 2014
Disclosures related to the disposal              
Pre-tax gain on sale or abandonment $ 86.5us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal $ 0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal $ 0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal        
Assets and liabilities classified as held for sale on balance sheets              
Assets held for sale 0.7us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation 277.9us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation          
Total liabilities 0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation 49.1us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation          
ITF | Compressed natural gas fueling stations              
Disclosures related to the disposal              
Number of compressed natural gas fueling stations sold             8teg_NumberOfCompressedNaturalGasFuelingStationsSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
Holding Company and Other | Winnebago Energy Center              
Disclosures related to the disposal              
Pre-tax gain on sale or abandonment       5.0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_WinnebagoEnergyCenterMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
     
Proceeds received for both insurance recovery for damage caused by the fire and the sale of miscellaneous parts       6.1us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_WinnebagoEnergyCenterMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
     
Holding Company and Other | AMP Americas, LLC | Compressed natural gas fueling stations              
Disclosures related to the disposal              
Variable interest entity ownership interest (as a percent)         70.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
   
Holding Company and Other | ITF | Compressed natural gas fueling stations              
Disclosures related to the disposal              
Number of compressed natural gas fueling stations sold             8teg_NumberOfCompressedNaturalGasFuelingStationsSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
Variable interest entity ownership interest (as a percent)         30.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
   
Fair value of CNG fueling stations sold             13.0us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
Cash proceeds from sale         7.2us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
   
Note receivable from the buyer         2.7teg_DisposalGroupIncludingDiscontinuedOperationSellerFinancedNoteReceivable
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
   
Term of note receivable from the buyer         7 years    
Equity contribution to maintain ownership interest         3.1us-gaap_ContributionOfProperty
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
   
Pre-tax gain on sale or abandonment         1.8us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
   
Deferred gain on sale             0.8us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
Property, plant, and equipment, net of accumulated depreciation   5.3us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
        10.4us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
Accumulated depreciation   0.3teg_DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
        0.7teg_DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
Assets and liabilities classified as held for sale on balance sheets              
Property, plant, and equipment, net of accumulated depreciation   5.3us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
        10.4us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= teg_SaleOfCompressedNaturalGasFuelingStationsMember
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_HoldingCompanyAndOtherMember
Electric Utility | UPPCO              
Disclosures related to the disposal              
Cash proceeds from sale           336.7us-gaap_ProceedsFromDivestitureOfBusinesses
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Pre-tax gain on sale or abandonment       85.4us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
     
After-tax gain on sale       51.2teg_DisposalGroupNotDiscontinuedOperationsAftertaxGainLossOnDisposal
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
     
Property, plant, and equipment, net of accumulated depreciation   193.8us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
      194.4us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Accumulated depreciation   88.9teg_DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciation
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
      91.3teg_DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciation
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Transaction costs related to a sale       1.1teg_TransactionCostsRelatedToASale
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
     
Intercompany payables included in a sale   1.6teg_DisposalGroupIntercompanyPayableIncludedInSale
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
         
Assets and liabilities classified as held for sale on balance sheets              
Current assets   26.5us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
      24.3us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Property, plant, and equipment, net of accumulated depreciation   193.8us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
      194.4us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Other long-term assets   51.6us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
      72.8us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Assets held for sale   271.9us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
      291.5us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Current liabilities   16.7us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
      12.7us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Long-term liabilities   32.4us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
      28.6us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Total liabilities   $ 49.1us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
      $ 41.3us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
/ dei_LegalEntityAxis
= teg_UPPCOMember
/ us-gaap_StatementBusinessSegmentsAxis
= teg_ElectricUtilityMember
 
Electric Utility | UPPCO | Minimum              
Disclosures related to the disposal              
Transition period for services           18 months  
Electric Utility | UPPCO | Maximum              
Disclosures related to the disposal              
Transition period for services           30 months