FAIR VALUE MEASUREMENTS - Schedule of Fair Values of Financial Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Liabilities:
Fair Value, Long-term debt, including current portion	$ 2,615.4	$ 2,770.9
Carrying Value, Long-term debt, including current portion	2,912.8	2,681.2
Level 1
Liabilities:
Fair Value, Long-term debt, including current portion	0.0	0.0
Level 2
Liabilities:
Fair Value, Long-term debt, including current portion	2,615.4	2,770.9
Level 3
Liabilities:
Fair Value, Long-term debt, including current portion	$ 0.0	$ 0.0