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LONG-TERM OBLIGATIONS - Letters of credit outstanding (Details) - Continuing Operations - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Letters of credit outstanding $ 107.8 $ 82.5
Credit Agreement    
Debt Instrument [Line Items]    
Letters of credit outstanding 0.0 0.0
Additional Credit Agreement    
Debt Instrument [Line Items]    
Letters of credit outstanding 62.8 35.3
Bilateral Arrangements    
Debt Instrument [Line Items]    
Letters of credit outstanding $ 45.0 $ 47.2