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FAIR VALUE MEASUREMENTS (Fair Value and Carrying Value of Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross $ 1,470.1 $ 3,704.4
Unamortized deferred financing costs (35.2) (31.6)
Long-term debt 1,434.9 3,673.3
Long-term Debt, Fair Value 1,363.7 3,147.9
Long-term debt, Fair value 1,363.7 3,147.9
Unamortized premium 0.0 0.5
Revolving Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term line of credit 0.0 900.0
Lines of Credit, Fair Value Disclosure [1] 0.0 900.0
2025 Senior Secured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt 0.0 1,250.0
Long-term Debt, Fair Value [2] 0.0 1,192.7
2028 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt 801.6 826.5
Long-term Debt, Fair Value [2] 703.7 520.9
2025 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt 664.5 669.5
Long-term Debt, Fair Value [2] 656.0 475.9
Catalyst financing arrangements    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt 4.0 58.4
Long-term Debt, Fair Value [3] $ 4.0 $ 58.4
[1] The estimated fair value approximates carrying value, categorized as a Level 2 measurement, as these borrowings bear interest based upon short-term floating market interest rates.
[2] The estimated fair value, categorized as a Level 2 measurement, was calculated based on the present value of future expected payments utilizing implied current market interest rates based on quoted prices of the outstanding senior notes.
[3] Catalyst financing arrangements are valued using a market approach based upon commodity prices for similar instruments quoted in active markets and are categorized as a Level 2 measurement. The Company has elected the fair value option for accounting for its catalyst repurchase obligations as the Company’s liability is directly impacted by the change in fair value of the underlying catalyst.