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LONG-TERM DEBT - Schedule of Line of Credit Facilities (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Maximum Availability $ 1,200,000,000.0  
Outstanding Borrowings 232,000,000.0  
Letters of Credit Under Credit Agreement 714,000,000.0 $ 354,200,000
Current Availability 938,000,000.0  
Line of Credit    
Debt Instrument [Line Items]    
Letters of Credit Under Credit Agreement $ 30,000,000.0