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FAIR VALUE - ASSETS AND LIABILITIES MEASURED ON A RECURRING BASIS (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets    
Risk Management Assets $ 340.9 $ 315.5
Liabilities    
Risk Management Liabilities 235.9 226.6
Fair value measurements on a recurring basis | Level 1
    
Assets    
Risk Management Assets 112.8 83.9
Liabilities    
Risk Management Liabilities 140.2 113.6
Fair value measurements on a recurring basis | Level 2
    
Assets    
Risk Management Assets 182.3 177.8
Liabilities    
Risk Management Liabilities 72.3 81.3
Fair value measurements on a recurring basis | Level 3
    
Assets    
Risk Management Assets 45.8 53.8
Liabilities    
Risk Management Liabilities 23.4 31.7
Fair value measurements on a recurring basis | Total, Fair value
    
Assets    
Risk Management Assets 340.9 315.5
Liabilities    
Risk Management Liabilities 235.9 226.6
Fair value measurements on a recurring basis | Utility segments | Natural gas contracts | Level 1
    
Assets    
Risk Management Assets 2.4 2.4
Liabilities    
Risk Management Liabilities 0.8 0.5
Fair value measurements on a recurring basis | Utility segments | Natural gas contracts | Level 2
    
Assets    
Risk Management Assets 5.5 7.7
Liabilities    
Risk Management Liabilities 3.5 0.6
Fair value measurements on a recurring basis | Utility segments | Natural gas contracts | Level 3
    
Assets    
Risk Management Assets 0 0
Liabilities    
Risk Management Liabilities 0 0
Fair value measurements on a recurring basis | Utility segments | Natural gas contracts | Total, Fair value
    
Assets    
Risk Management Assets 7.9 10.1
Liabilities    
Risk Management Liabilities 4.3 1.1
Fair value measurements on a recurring basis | Utility segments | FTRs | Level 1
    
Assets    
Risk Management Assets 0 0
Liabilities    
Risk Management Liabilities 0 0
Fair value measurements on a recurring basis | Utility segments | FTRs | Level 2
    
Assets    
Risk Management Assets 0 0
Liabilities    
Risk Management Liabilities 0 0
Fair value measurements on a recurring basis | Utility segments | FTRs | Level 3
    
Assets    
Risk Management Assets 3.4 2.1
Liabilities    
Risk Management Liabilities 0.4 0.3
Fair value measurements on a recurring basis | Utility segments | FTRs | Total, Fair value
    
Assets    
Risk Management Assets 3.4 2.1
Liabilities    
Risk Management Liabilities 0.4 0.3
Fair value measurements on a recurring basis | Utility segments | Petroleum product contracts | Level 1
    
Assets    
Risk Management Assets   0.1
Liabilities    
Risk Management Liabilities 0.6  
Fair value measurements on a recurring basis | Utility segments | Petroleum product contracts | Level 2
    
Assets    
Risk Management Assets   0
Liabilities    
Risk Management Liabilities 0  
Fair value measurements on a recurring basis | Utility segments | Petroleum product contracts | Level 3
    
Assets    
Risk Management Assets   0
Liabilities    
Risk Management Liabilities 0  
Fair value measurements on a recurring basis | Utility segments | Petroleum product contracts | Total, Fair value
    
Assets    
Risk Management Assets   0.1
Liabilities    
Risk Management Liabilities 0.6  
Fair value measurements on a recurring basis | Utility segments | Coal contracts | Level 1
    
Assets    
Risk Management Assets 0 0
Liabilities    
Risk Management Liabilities 0 0
Fair value measurements on a recurring basis | Utility segments | Coal contracts | Level 2
    
Assets    
Risk Management Assets 0 0
Liabilities    
Risk Management Liabilities 0 0
Fair value measurements on a recurring basis | Utility segments | Coal contracts | Level 3
    
Assets    
Risk Management Assets 2.4 0.2
Liabilities    
Risk Management Liabilities 2.4 2.7
Fair value measurements on a recurring basis | Utility segments | Coal contracts | Total, Fair value
    
Assets    
Risk Management Assets 2.4 0.2
Liabilities    
Risk Management Liabilities 2.4 2.7
Fair value measurements on a recurring basis | Integrys Energy Services | Level 1
    
Liabilities    
Contingent consideration related to the acquisition of Compass Energy Services   0
Fair value measurements on a recurring basis | Integrys Energy Services | Level 2
    
Liabilities    
Contingent consideration related to the acquisition of Compass Energy Services   0
Fair value measurements on a recurring basis | Integrys Energy Services | Level 3
    
Liabilities    
Contingent consideration related to the acquisition of Compass Energy Services   7.8
Fair value measurements on a recurring basis | Integrys Energy Services | Total, Fair value
    
Liabilities    
Contingent consideration related to the acquisition of Compass Energy Services   7.8
Fair value measurements on a recurring basis | Integrys Energy Services | Natural gas contracts | Level 1
    
Assets    
Risk Management Assets 21.2 16.3
Liabilities    
Risk Management Liabilities 15.3 14.3
Fair value measurements on a recurring basis | Integrys Energy Services | Natural gas contracts | Level 2
    
Assets    
Risk Management Assets 41.4 35.2
Liabilities    
Risk Management Liabilities 30.4 22.0
Fair value measurements on a recurring basis | Integrys Energy Services | Natural gas contracts | Level 3
    
Assets    
Risk Management Assets 27.6 35.6
Liabilities    
Risk Management Liabilities 16.7 25.2
Fair value measurements on a recurring basis | Integrys Energy Services | Natural gas contracts | Total, Fair value
    
Assets    
Risk Management Assets 90.2 87.1
Liabilities    
Risk Management Liabilities 62.4 61.5
Fair value measurements on a recurring basis | Integrys Energy Services | Electric contracts | Level 1
    
Assets    
Risk Management Assets 89.2 65.1
Liabilities    
Risk Management Liabilities 123.5 98.8
Fair value measurements on a recurring basis | Integrys Energy Services | Electric contracts | Level 2
    
Assets    
Risk Management Assets 135.4 134.9
Liabilities    
Risk Management Liabilities 38.4 58.7
Fair value measurements on a recurring basis | Integrys Energy Services | Electric contracts | Level 3
    
Assets    
Risk Management Assets 12.4 15.9
Liabilities    
Risk Management Liabilities 3.9 3.5
Fair value measurements on a recurring basis | Integrys Energy Services | Electric contracts | Total, Fair value
    
Assets    
Risk Management Assets 237.0 215.9
Liabilities    
Risk Management Liabilities 165.8 161.0
Fair value measurements on a recurring basis | Holding Company and Other | Level 1
    
Assets    
Investment in Exchange-Traded Funds 16.3 15.9
Fair value measurements on a recurring basis | Holding Company and Other | Level 2
    
Assets    
Investment in Exchange-Traded Funds 0 0
Fair value measurements on a recurring basis | Holding Company and Other | Level 3
    
Assets    
Investment in Exchange-Traded Funds 0 0
Fair value measurements on a recurring basis | Holding Company and Other | Total, Fair value
    
Assets    
Investment in Exchange-Traded Funds $ 16.3 $ 15.9