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LONG-TERM OBLIGATIONS - Schedule of Letters of Credit Outstanding (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Letters of credit outstanding, amount $ 118.8 $ 107.8
$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 74.3 62.8
Bilateral Arrangements    
Debt Instrument [Line Items]    
Letters of credit outstanding, amount $ 44.5 $ 45.0