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RISK MANAGEMENT ACTIVITIES (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Assets    
Derivative assets subject to master netting or similar arrangements, gross amount $ 314.2 $ 188.2
Potential effects of netting, including cash collateral 180.2 148.4
Derivative assets subject to master netting or similar arrangements, net amount 134.0 39.8
Derivative assets not subject to master netting or similar arrangements 1.3 2.5
Risk Management Assets 315.5 190.7
Total Risk Management Assets, Net Amount 135.3 42.3
Liabilities    
Derivative liabilities subject to master netting or similar arrangements, gross amount 223.5 230.7
Potential effects of netting, including cash collateral 179.5 163.6
Derivative liabilities subject to master netting or similar arrangements, net amount 44.0 67.1
Derivative liabilities not subject to master netting or similar arrangements 3.1 9.6
Risk Management Liabilities 226.6 240.3
Total Risk Management Liabilities, Net Amount 47.1 76.7
Utility segments
   
Assets    
Derivative assets subject to master netting or similar arrangements, gross amount 12.3 5.7
Potential effects of netting, including cash collateral 2.1 3.0
Derivative assets subject to master netting or similar arrangements, net amount 10.2 2.7
Liabilities    
Derivative liabilities subject to master netting or similar arrangements, gross amount 1.4 15.3
Potential effects of netting, including cash collateral 1.4 3.8
Derivative liabilities subject to master netting or similar arrangements, net amount 0 11.5
Nonregulated segments
   
Assets    
Derivative assets subject to master netting or similar arrangements, gross amount 301.9 182.5
Potential effects of netting, including cash collateral 178.1 145.4
Derivative assets subject to master netting or similar arrangements, net amount 123.8 37.1
Liabilities    
Derivative liabilities subject to master netting or similar arrangements, gross amount 222.1 215.4
Potential effects of netting, including cash collateral 178.1 159.8
Derivative liabilities subject to master netting or similar arrangements, net amount $ 44.0 $ 55.6