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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