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FAIR VALUE MEASUREMENTS (Measured on Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ 9.0 | $ 33.8 |
Derivative, Collateral, Right to Reclaim Cash | (6.0) | (33.8) |
Derivative Liability | 3.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 2.3 | 32.8 |
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 6.7 | 1.0 |
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member] | Level 3 [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 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Catalyst lease obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative, Collateral, Right to Reclaim Cash | 0.0 | 0.0 |
Obligations, Fair Value Disclosure | 102.5 | 47.6 |
Fair Value, Measurements, Recurring [Member] | Catalyst lease obligations [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Obligations, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Catalyst lease obligations [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Obligations, Fair Value Disclosure | 102.5 | 47.6 |
Fair Value, Measurements, Recurring [Member] | Catalyst lease obligations [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Obligations, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative, Collateral, Right to Reclaim Cash | 0.0 | 0.0 |
Obligations, Fair Value Disclosure | 12.1 | 26.1 |
Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Obligations, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Obligations, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Obligations, Fair Value Disclosure | 12.1 | 26.1 |
Fair Value, Measurements, Recurring [Member] | Inventory Intermediation Agreement Obligation [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | 1.3 |
Derivative, Collateral, Right to Reclaim Cash |  | 0.0 |
Derivative Liability |  | 1.3 |
Fair Value, Measurements, Recurring [Member] | Inventory Intermediation Agreement Obligation [Member] | Level 1 [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 |
Fair Value, Measurements, Recurring [Member] | Inventory Intermediation Agreement Obligation [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | 1.3 |
Fair Value, Measurements, Recurring [Member] | Inventory Intermediation Agreement Obligation [Member] | Level 3 [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 |
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 411.6 | 111.8 |
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 411.6 | 111.8 |
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 6.0 | 34.0 |
Derivative, Collateral, Obligation to Return Cash | (6.0) | (33.8) |
Derivative Asset | 0.0 | 0.2 |
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 2.5 | 32.5 |
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 3.5 | 1.5 |
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member] | Level 3 [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 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Inventory Intermediation Agreement Obligation [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 11.3 |  |
Derivative, Collateral, Obligation to Return Cash | 0.0 |  |
Derivative Asset | 11.3 |  |
Fair Value, Measurements, Recurring [Member] | Inventory Intermediation Agreement Obligation [Member] | Level 1 [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 |  |
Fair Value, Measurements, Recurring [Member] | Inventory Intermediation Agreement Obligation [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 11.3 |  |
Fair Value, Measurements, Recurring [Member] | Inventory Intermediation Agreement Obligation [Member] | Level 3 [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 |  |
Pension Benefits [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 255.8 | 197.4 | $ 143.4
Pension Benefits [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 255.8 | 197.4 |
Pension Benefits [Member] | Other Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 21.2 | $ 10.3 |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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