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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Fair value of long-term debt $ 3,000.0   $ 3,000.0   $ 2,600.0
Carrying value of long-term debt 2,800.0   2,800.0   $ 2,600.0
Other Current Assets          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Restricted cash and cash equivalents 17.8   17.8    
Other Current Liabilities          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Restricted cash and cash equivalents $ 17.8   $ 17.8    
Stock options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive stock options (in shares) 1.2 0.7 1.3 0.6