FAIR VALUE MEASUREMENTS (Measured on Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative, Collateral, Obligation to Return Cash | $ (23.7) | | |
Qualified Plan | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 349.3 | $ 274.2 | $ 306.3 |
Level 1 | Qualified Plan | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 349.3 | 274.2 | |
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 | | 18.6 | |
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 | 46.9 | 35.6 | |
Derivative, Collateral, Right to Reclaim Cash | (46.9) | (35.6) | |
Derivative Liability | 0 | 0 | |
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 | 46.9 | 20.6 | |
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 | 0 | 11.8 | |
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 | 0 | 3.2 | |
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 | |
Derivative, Collateral, Right to Reclaim Cash | | 0 | |
Derivative Liability | | 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 | |
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 | |
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 | |
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 | 429.8 | 1,361.1 | |
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 | 429.8 | 1,361.1 | |
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 | 21.6 | 147.3 | |
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 | 21.6 | 147.3 | |
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 | 130.3 | 106.5 | |
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 | 130.3 | 106.5 | |
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 | 80.1 | 49.5 | |
Derivative, Collateral, Obligation to Return Cash | (46.9) | (35.6) | |
Derivative Asset | 33.2 | 13.9 | |
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 | 80.1 | 33.8 | |
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 | 0 | 15.7 | |
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 | |
Derivative, Collateral, Obligation to Return Cash | | 0 | |
Derivative Asset | | 25.1 | |
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 | |
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 | |
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 | |
Other Assets | Qualified Plan | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | $ 18.8 | | |