FAIR VALUE MEASUREMENTS - Schedule of Fair Values of Financial Liabilities (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets required to be measured at fair value	$ 0	$ 0
Financial liabilities required to be measured at fair value	0	0
Liabilities:
Long-term debt, including current portion	1,768,300,000	2,522,200,000
Long-term debt, including current portion, Carrying Value	3,261,600,000	3,194,200,000
Level 1
Liabilities:
Long-term debt, including current portion	0	0
Level 2
Liabilities:
Long-term debt, including current portion	1,768,300,000	2,522,200,000
Level 3
Liabilities:
Long-term debt, including current portion	$ 0	$ 0