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SCHEDULE I - CONDENSED PARENT COMPANY FINANCIAL STATEMENTS SHORT-TERM NOTES RECEIVABLE - RELATED PARTIES (Details) (Integrys Energy Group, Inc., USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
SHORT-TERM NOTES RECEIVABLE - RELATED PARTIES    
Short-term notes receivable from related parties $ 51.6us-gaap_DueFromRelatedPartiesCurrent $ 84.9us-gaap_DueFromRelatedPartiesCurrent
IES
    
SHORT-TERM NOTES RECEIVABLE - RELATED PARTIES    
Short-term notes receivable from related parties 0us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_IntegrysEnergyServicesMember		 23.5us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_IntegrysEnergyServicesMember
MGU
    
SHORT-TERM NOTES RECEIVABLE - RELATED PARTIES    
Short-term notes receivable from related parties 26.1us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_MGUMember		 21.8us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_MGUMember
MERC
    
SHORT-TERM NOTES RECEIVABLE - RELATED PARTIES    
Short-term notes receivable from related parties 11.1us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_MERCMember		 20.5us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_MERCMember
IBS
    
SHORT-TERM NOTES RECEIVABLE - RELATED PARTIES    
Short-term notes receivable from related parties 14.4us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_IBSMember		 10.2us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_IBSMember
UPPCO
    
SHORT-TERM NOTES RECEIVABLE - RELATED PARTIES    
Short-term notes receivable from related parties $ 0us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_UPPCOMember		 $ 8.9us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teg_UPPCOMember