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FAIR VALUE - FINANCIAL INSTRUMENTS NOT RECORDED AT FAIR VALUE (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Carrying value and estimated fair value of financial instruments    
Preferred stock $ 51.1 $ 51.1
Carrying Amount
   
Carrying value and estimated fair value of financial instruments    
Long-term debt 3,056.2 3,056.2
Preferred stock 51.1 51.1
Fair value
   
Carrying value and estimated fair value of financial instruments    
Long-term debt 3,076.4 3,031.6
Preferred stock $ 57.3 $ 61.2