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FAIR VALUE MEASUREMENTS (Details 3) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Carrying Amount    
Carrying amount and fair value of financial instruments    
Long-term debt (including current maturities) $ 6,657.1 $ 5,829.6
Fair Value    
Carrying amount and fair value of financial instruments    
Long-term debt (including current maturities) $ 6,963.9 $ 6,113.6