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CREDIT FACILITIES AND DEBT (Summary of Long-Term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 3,709.3 $ 3,704.4
Current debt (29.9) 0.0
Unamortized premium 0.4 0.5
Unamortized deferred financing costs (29.1) (31.6)
Long-term debt 3,650.7 3,673.3
Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term Line of Credit 900.0 900.0
2025 Senior Secured Notes    
Debt Instrument [Line Items]    
Long-term Debt [1] 1,250.0 1,250.0
2028 Senior Notes    
Debt Instrument [Line Items]    
Long-term Debt [1] 826.5 826.5
2025 Senior Notes    
Debt Instrument [Line Items]    
Long-term Debt [1] 669.5 669.5
Catalyst financing arrangements    
Debt Instrument [Line Items]    
Long-term Debt [2] $ 63.3 $ 58.4
[1] 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.
[2] 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.