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LONG-TERM DEBT (Interest) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Amortization of Senior Notes discount and issuance costs $ 2.4 $ 2.3 $ 2.3
Interest capitalized for construction in process (1.6) 0.0 0.0
Commitment fees and other 2.6 2.0 2.0
Total interest expense 31.4 32.3 32.3
Interest on outstanding borrowings      
Debt Instrument [Line Items]      
Total interest expense $ 28.0 $ 28.0 $ 28.0