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LONG-TERM OBLIGATIONS - Schedule of Letters of Credit Outstanding (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Letters of credit outstanding, amount $ 81.9 $ 80.1
$400 Million Facility    
Debt Instrument [Line Items]    
Letters of credit outstanding, amount 0.0 0.0
$300 Million Facility    
Debt Instrument [Line Items]    
Letters of credit outstanding, amount 35.1 34.8
Bilateral Arrangements    
Debt Instrument [Line Items]    
Letters of credit outstanding, amount $ 46.8 $ 45.3