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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Financial Instruments    
Preferred stock $ 30.4 $ 30.4
Carrying Amount    
Financial Instruments    
Preferred stock 30.4 30.4
Long-term debt, including current portion 9,464.2 9,561.7
Capital lease obligations 24.2 27.0
Fair Value    
Financial Instruments    
Preferred stock 28.3 30.5
Long-term debt, including current portion $ 9,762.1 $ 10,341.9