FAIR VALUE MEASUREMENTS (Measured on Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 |
Pension Plan [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | $ 306.3 | $ 255.8 | $ 197.4 |
Level 1 [Member] | Pension Plan [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 306.3 | 255.8 | |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | 21.2 | |
Commodity contract [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 83.5 | 9 | |
Derivative, Collateral, Right to Reclaim Cash | (71.5) | (6) | |
Derivative Liability | 12 | 3 | |
Commodity contract [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 79.7 | 2.3 | |
Commodity contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 3.8 | 6.7 | |
Commodity contract [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0 | |
Catalyst Obligation [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 58.4 | 102.5 | |
Derivative, Collateral, Right to Reclaim Cash | 0 | 0 | |
Derivative Liability | 58.4 | 102.5 | |
Catalyst Obligation [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | 0 | |
Catalyst Obligation [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 58.4 | 102.5 | |
Catalyst Obligation [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
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 [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 953.9 | | |
Derivative, Collateral, Right to Reclaim Cash | 0 | | |
Renewable Energy Credit and Emissions Obligation | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
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, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 953.9 | | |
Renewable Energy Credit and Emissions Obligation | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | | |
Contingent Consideration | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 29.4 | 0 | |
Derivative, Collateral, Right to Reclaim Cash | 0 | 0 | |
Contingent Consideration | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | 0 | |
Contingent Consideration | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 0 | 0 | |
Contingent Consideration | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | 29.4 | 0 | |
Money market funds [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and Cash Equivalents, Fair Value Disclosure | 260.9 | 402.3 | |
Money market funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and Cash Equivalents, Fair Value Disclosure | 260.9 | 402.3 | |
Money market funds [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
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 [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0 | |
Commodity contract [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 71.5 | 6 | |
Derivative, Collateral, Obligation to Return Cash | (71.5) | (6) | |
Derivative Asset | 0 | 0 | |
Commodity contract [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 71.5 | 2.5 | |
Commodity contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 3.5 | |
Commodity contract [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0 | |
Inventory Intermediation Agreement Obligation [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 19.7 | 11.3 | |
Derivative, Collateral, Obligation to Return Cash | 0 | 0 | |
Derivative Asset | 19.7 | 11.3 | |
Inventory Intermediation Agreement Obligation [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0 | |
Inventory Intermediation Agreement Obligation [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 19.7 | 11.3 | |
Inventory Intermediation Agreement Obligation [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | | | |
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 [Member] | Pension Plan [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | $ 20.7 | | |