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RISK MANAGEMENT ACTIVITIES - NETTING ARRANGEMENTS (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets    
Derivative assets subject to master netting or similar arrangements, gross amount $ 338.1 $ 314.2
Potential effects of netting, including cash collateral 199.5 180.2
Derivative assets subject to master netting or similar arrangements, net amount 138.6 134.0
Derivative assets not subject to master netting or similar arrangements 2.8 1.3
Risk Management Assets 340.9 315.5
Total Risk Management Assets, Net Amount 141.4 135.3
Liabilities    
Derivative liabilities subject to master netting or similar arrangements, gross amount 232.1 223.5
Potential effects of netting, including cash collateral 204.4 179.5
Derivative liabilities subject to master netting or similar arrangements, net amount 27.7 44.0
Derivative liabilities not subject to master netting or similar arrangement 3.8 3.1
Risk Management Liabilities 235.9 226.6
Total Risk Management Liabilities, Net Amount 31.5 47.1
Utility segments
   
Assets    
Derivative assets subject to master netting or similar arrangements, gross amount 11.3 12.3
Potential effects of netting, including cash collateral 4.0 2.1
Derivative assets subject to master netting or similar arrangements, net amount 7.3 10.2
Liabilities    
Derivative liabilities subject to master netting or similar arrangements, gross amount 5.3 1.4
Potential effects of netting, including cash collateral 4.4 1.4
Derivative liabilities subject to master netting or similar arrangements, net amount 0.9 0
Integrys Energy Services
   
Assets    
Derivative assets subject to master netting or similar arrangements, gross amount 326.8 301.9
Potential effects of netting, including cash collateral 195.5 178.1
Derivative assets subject to master netting or similar arrangements, net amount 131.3 123.8
Liabilities    
Derivative liabilities subject to master netting or similar arrangements, gross amount 226.8 222.1
Potential effects of netting, including cash collateral 200.0 178.1
Derivative liabilities subject to master netting or similar arrangements, net amount $ 26.8 $ 44.0