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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Financial Instruments    
Preferred stock $ 30.4 $ 30.4
Carrying Amount    
Financial Instruments    
Preferred stock 30.4 30.4
Long-term debt, including current portion 9,479.8 9,285.8
Capital lease obligations 28.3 29.6
Fair Value    
Financial Instruments    
Preferred stock 30.5 28.8
Long-term debt, including current portion $ 10,128.3 $ 9,818.2