v3.26.1
CONDENSED COMBINED DEBTOR-IN-POSSESSION FINANCIAL INFORMATION - Debtors' Statement of Cash Flows (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Cash flows from operating activities      
Cash used in operating activities $ (348.2) $ (103.4)  
Cash flows from investing activities      
Capital expenditures (21.3) (18.5)  
Cash used in investing activities (16.5) (18.5)  
Cash flows from financing activities      
Payments for debt issuance and extinguishment costs (10.8) (19.8)  
Short-term borrowings, net (1.0) (2.3)  
Repurchases and repayments of long-term debt (3.0) (9.6)  
Proceeds from Revolving Facility 304.6 50.0  
Repayments of Revolving Facility (41.2) (50.0)  
Borrowing under the DIP Facility 142.5    
Cash provided by financing activities 417.1 42.2  
Effect of exchange rates on cash (3.0) 7.0  
Net change in cash, cash equivalents, and restricted cash 49.4 (72.7)  
Cash, cash equivalents, and restricted cash-beginning of period 149.0 211.9  
Cash, cash equivalents, and restricted cash-end of period 198.4 139.2  
Less: Restricted cash (included within "Other Current Assets") 17.0 2.2  
Cash and cash equivalents-end of period 181.4 $ 137.0 $ 146.7
Trinseo PLC and certain direct and indirect subsidiaries      
Cash flows from operating activities      
Cash used in operating activities (328.3)    
Cash flows from investing activities      
Capital expenditures (6.6)    
Cash used in investing activities (6.6)    
Cash flows from financing activities      
Payments for debt issuance and extinguishment costs (10.8)    
Repurchases and repayments of long-term debt (3.0)    
Proceeds from Revolving Facility 304.6    
Repayments of Revolving Facility (41.2)    
Borrowing under the DIP Facility 142.5    
Cash provided by financing activities 392.1    
Net change in cash, cash equivalents, and restricted cash 57.2    
Cash, cash equivalents, and restricted cash-beginning of period 17.4    
Cash, cash equivalents, and restricted cash-end of period 74.6    
Less: Restricted cash (included within "Other Current Assets") 14.4    
Cash and cash equivalents-end of period $ 60.2