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FAIR VALUE (Details 5) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Carrying value and estimated fair value of financial instruments    
Long-term debt $ 2,782.7 $ 2,245.2
Preferred stock 51.1 51.1
Carrying Amount
   
Carrying value and estimated fair value of financial instruments    
Long-term debt 2,782.7 2,245.2
Preferred stock 51.1 51.1
Total, Fair value
   
Carrying value and estimated fair value of financial instruments    
Long-term debt 2,768.5 2,425.8
Preferred stock $ 61.6 $ 52.7