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FAIR VALUE (Details 5) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Financial instruments not recorded at fair value    
Long-term debt $ 3,056.2 $ 2,245.2
Preferred stock of subsidiary – $100 par value; 1,000,000 shares authorized; 511,882 shares issued; 510,495 shares outstanding 51.1 51.1
Carrying Amount
   
Financial instruments not recorded at fair value    
Long-term debt 3,056.2 2,245.2
Preferred stock of subsidiary – $100 par value; 1,000,000 shares authorized; 511,882 shares issued; 510,495 shares outstanding 51.1 51.1
Fair value
   
Financial instruments not recorded at fair value    
Long-term debt 3,031.6 2,425.8
Preferred stock of subsidiary – $100 par value; 1,000,000 shares authorized; 511,882 shares issued; 510,495 shares outstanding $ 61.2 $ 52.7