XML 142 R137.htm IDEA: XBRL DOCUMENT v2.4.1.9
VARIABLE INTEREST ENTITIES (Details)
 12 Months Ended
Dec. 31, 2014
Nov. 01, 2014
AMP Trillium, LLC | Co-venturer    
Variable interest entities    
Variable interest entity ownership interest (as a percent) 70.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= teg_AMPTrilliumLLCMember		  
AMP Trillium, LLC | ITF    
Variable interest entities    
Variable interest entity ownership interest (as a percent) 30.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= teg_AMPTrilliumLLCMember		  
Number of CNG fueling stations sold   8teg_NumberOfCompressedNaturalGasFuelingStationsSold
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= teg_AMPTrilliumLLCMember
EVO Trillium, LLC | Co-venturer    
Variable interest entities    
Variable interest entity ownership interest (as a percent) 85.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= teg_EVOTrilliumLLCMember		  
EVO Trillium, LLC | ITF    
Variable interest entities    
Variable interest entity ownership interest (as a percent) 15.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ dei_LegalEntityAxis
= teg_IntegrysTransportationFuelsLLCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= teg_EVOTrilliumLLCMember