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FAIR VALUE (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 3
Dec. 31, 2012
Fair value measurements on a recurring basis
Level 3
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 3
FTRs
Dec. 31, 2012
Fair value measurements on a recurring basis
Level 3
FTRs
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 3
FTRs
Valuation Technique: Market-based
Average
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 3
Coal contract
Dec. 31, 2012
Fair value measurements on a recurring basis
Level 3
Coal contract
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 3
Coal contract
Valuation Technique: Market-based
Minimum
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 3
Coal contract
Valuation Technique: Market-based
Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information                      
Risk Management Asset $ 2.4 $ 3.9 $ 1.7 $ 3.7 $ 1.5 $ 1.2   $ 0.2 $ 2.5    
Risk Management Liability $ 3.1 $ 9.7 $ 3.0 $ 9.1 $ 0.3 $ 0.1   $ 2.7 $ 9.0    
Fair Value Inputs                      
Forward market prices (in dollars per megawatt-month or ton)             121.68     11.73 14.30