FAIR VALUE MEASUREMENTS (Measured on Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 |
Qualified Plan | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | $ 274.2 | $ 306.3 | $ 255.8 |
Level 1 | Qualified Plan | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 274.2 | 306.3 | |
Level 1 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | 20.7 | |
Commodity contracts | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 35.6 | 83.5 | |
Derivative, Collateral, Right to Reclaim Cash | (35.6) | (71.5) | |
Derivative Liability | 0 | 12 | |
Commodity contracts | Level 1 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 20.6 | 79.7 | |
Commodity contracts | Level 2 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 11.8 | 3.8 | |
Commodity contracts | Level 3 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 3.2 | 0 | |
Catalyst financing arrangements | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 4 | 58.4 | |
Derivative, Collateral, Right to Reclaim Cash | 0 | 0 | |
Derivative Liability | 4 | 58.4 | |
Catalyst financing arrangements | Level 1 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | 0 | |
Catalyst financing arrangements | Level 2 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 4 | 58.4 | |
Catalyst financing arrangements | Level 3 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | 0 | |
Renewable Energy Credit and Emissions Obligation | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 1,361.1 | 953.9 | |
Derivative, Collateral, Right to Reclaim Cash | 0 | 0 | |
Renewable Energy Credit and Emissions Obligation | Level 1 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | 0 | |
Renewable Energy Credit and Emissions Obligation | Level 2 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 1,361.1 | 953.9 | |
Renewable Energy Credit and Emissions Obligation | Level 3 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | 0 | |
Contingent Consideration | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 147.3 | 29.4 | |
Derivative, Collateral, Right to Reclaim Cash | 0 | 0 | |
Contingent Consideration | Level 1 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | 0 | |
Contingent Consideration | Level 2 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | 0 | |
Contingent Consideration | Level 3 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 147.3 | 29.4 | |
Money market funds | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and Cash Equivalents, Fair Value Disclosure | 106.5 | 260.9 | |
Money market funds | Level 1 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and Cash Equivalents, Fair Value Disclosure | 106.5 | 260.9 | |
Money market funds | Level 2 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0 | |
Money market funds | Level 3 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0 | |
Commodity contracts | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 49.5 | 71.5 | |
Derivative, Collateral, Obligation to Return Cash | (35.6) | (71.5) | |
Derivative Asset | 13.9 | 0 | |
Commodity contracts | Level 1 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 33.8 | 71.5 | |
Commodity contracts | Level 2 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 15.7 | 0 | |
Commodity contracts | Level 3 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0 | |
Derivatives included within inventory intermediation agreement obligations | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 25.1 | 19.7 | |
Derivative, Collateral, Obligation to Return Cash | 0 | 0 | |
Derivative Asset | 25.1 | 19.7 | |
Derivatives included within inventory intermediation agreement obligations | Level 1 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0 | |
Derivatives included within inventory intermediation agreement obligations | Level 2 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 25.1 | 19.7 | |
Derivatives included within inventory intermediation agreement obligations | Level 3 | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | $ 0 | |
Other Assets | Qualified Plan | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | $ 18.6 | | |