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RESTRUCTURING ACTIVITIES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring subtotal | $ 5.8 |  | $ 12.9 |
Asset optimization and corporate restructuring, cost incurred to date | 67.4 |  | 67.4 |
Restructuring Charges | $ 7.3 | $ 5.8 | $ 15.9 | $ 13.5
Restructuring, Incurred Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense | Selling, General and Administrative Expense | Selling, General and Administrative Expense
Restructuring Reserve [Roll Forward] |  |  |  |
Accrued charges/Balance at beginning of period |  |  | $ 16.7 |
Expenses |  |  | 15.4 |
Deductions |  |  | (22.2) |
Accrued charges/Balance at end of period | $ 9.9 |  | 9.9 |
Transformational Restructuring Program |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Cumulative life-to-date charges | 6.7 |  | 6.7 |
Accelerated Depreciation | Asset restructuring plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | $ 4.3 |  | $ 8.3
Employee termination benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 0.2 |  | 0.7 |
Restructuring Reserve [Roll Forward] |  |  |  |
Accrued charges/Balance at beginning of period |  |  | 16.7 |
Expenses |  |  | 0.1 |
Deductions |  |  | (6.9) |
Accrued charges/Balance at end of period | 9.9 |  | 9.9 |
Employee termination benefits | Corporate Restructuring Program |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring subtotal | 0.1 |  | 1.3 |
Asset optimization and corporate restructuring, cost incurred to date | 10.1 |  | 10.1 |
Employee termination benefits | Transformational Restructuring Program |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Cumulative life-to-date charges | 6.7 |  | 6.7 |
Employee termination benefits | Asset restructuring plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 0.0 | 0.0 | (0.6) | (0.6)
Contract terminations |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Expenses |  |  | 9.8 |
Deductions |  |  | (9.8) |
Contract terminations | Asset restructuring plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 1.3 | 1.8 | 3.1 | 4.3
Expected restructuring charges | 10.1 |  | 10.1 |
Decommissioning and other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring subtotal |  |  | 9.0 |
Restructuring Charges | 2.6 |  | 5.5 |
Restructuring Reserve [Roll Forward] |  |  |  |
Expenses |  |  | 5.5 |
Deductions |  |  | (5.5) |
Decommissioning and other | Asset restructuring plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 0.2 | (0.3) | 0.5 | 1.5
Expected restructuring charges | 0.3 |  | 0.3 |
Plastics Solutions | Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring, cost incurred to date | 19.6 |  | 19.6 |
Restructuring Charges |  | 4.3 |  | 5.2
Cumulative life-to-date charges | 27.4 |  | 27.4 |
Plastics Solutions | Accelerated Depreciation | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 0.9 |  | 1.1
Plastics Solutions | Employee termination benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring subtotal | 0.1 |  | (0.6) |
Asset optimization and corporate restructuring, cost incurred to date | 4.8 |  | 4.8 |
Restructuring Charges |  |  |  | (0.2)
Cumulative life-to-date charges | 3.7 |  | 3.7 |
Plastics Solutions | Contract terminations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring subtotal | 3.0 |  | 6.7 |
Asset optimization and corporate restructuring, cost incurred to date | 9.3 |  | 9.3 |
Restructuring Charges | 1.3 | 1.8 | 3.1 | 4.3
Cumulative life-to-date charges | 11.3 |  | 11.3 |
Plastics Solutions | Contract terminations | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 0.4 |  |
Plastics Solutions | Decommissioning and other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring subtotal | 2.3 |  | 4.1 |
Asset optimization and corporate restructuring, cost incurred to date | 9.1 |  | 9.1 |
Restructuring Charges | 0.2 | 0.4 | 0.5 | 0.9
Cumulative life-to-date charges | 4.7 |  | 4.7 |
Plastics Solutions | Decommissioning and other | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 0.1 |  | 0.1
Plastic Solution | Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Cumulative life-to-date charges | 1.4 |  | 1.4 |
Plastic Solution | Employee termination benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  | (0.6) | (0.4)
Cumulative life-to-date charges | 2.4 |  | 2.4 |
Plastic Solution | Employee termination benefits | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  |  | 0.9
Plastic Solution | Decommissioning and other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 0.7 | 1.9 | 1.4
Feedstocks | Contract terminations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring subtotal | 3.0 |  | 6.7 |
Engineered Materials |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 1.5 | 5.8 | 3.0 | 13.5
Cumulative life-to-date charges | 63.1 |  | 63.1 |
Engineered Materials | Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring, cost incurred to date | 9.3 |  | 9.3 |
Restructuring Charges |  |  |  | 3.1
Cumulative life-to-date charges | 6.3 |  | 6.3 |
Engineered Materials | Employee termination benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring, cost incurred to date | 1.2 |  | 1.2 |
Cumulative life-to-date charges | 2.7 |  | 2.7 |
Engineered Materials | Decommissioning and other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset optimization and corporate restructuring subtotal | 0.3 |  | 1.4 |
Asset optimization and corporate restructuring, cost incurred to date | 4.0 |  | 4.0 |
Restructuring Charges |  | (1.4) |  | (0.8)
Cumulative life-to-date charges | $ 1.3 |  | $ 1.3 |
Latex Binders | Accelerated Depreciation | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 0.7 |  | 0.9
Latex Binders | Contract terminations | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 0.3 |  | 0.7
Latex Binders | Decommissioning and other | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 0.1 |  | 0.2
Polystyrene | Accelerated Depreciation | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 2.7 |  | 3.2
Polystyrene | Employee termination benefits | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  |  | (0.2)
Polystyrene | Contract terminations | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 1.1 |  | 2.7
Polystyrene | Decommissioning and other | Revision of Prior Period |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | $ 0.2 |  | $ 0.6

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