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FAIR VALUE MEASUREMENTS (Fair Value and Carrying Value of Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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, Excluding Current Maturities 3,650.7 3,673.3
Long-term debt, Fair value 3,519.7 3,147.9
Long-Term Debt And Capital Lease Obligations, Current, Fair Value Disclosure (29.9) 0.0
Long-term debt, excluding current maturities, Fair value 3,489.8 3,147.9
Revolving Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Line of Credit 900.0 900.0
2025 Senior Secured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt [1] 1,250.0 1,250.0
Long-term debt, Fair value [1] 1,292.8 1,192.7
2028 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt [1] 826.5 826.5
Long-term debt, Fair value [1] 660.2 520.9
2025 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt [1] 669.5 669.5
Long-term debt, Fair value [1] 603.4 475.9
Revolving Credit Facility | Revolving Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Line of Credit [2] 900.0 900.0
Lines of Credit, Fair Value Disclosure [2] 900.0 900.0
Catalyst financing arrangements    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt [3] 63.3 58.4
Long-term debt, Fair value [3] $ 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] 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.
[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.