v3.25.2
SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of Segment Reporting to Consolidated (Details) - segment
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
SEGMENTS AND GEOGRAPHIC INFORMATION    
Number of operating segments 4  
AmSty    
SEGMENTS AND GEOGRAPHIC INFORMATION    
Percentage of ownership underlying net assets 50.00% 50.00%
AmSty | Americas Styrenics    
SEGMENTS AND GEOGRAPHIC INFORMATION    
Percentage of ownership underlying net assets 50.00%