TRINSEO S.A., 10-Q/A filed on 11/12/2019
Amended Quarterly Report
v3.19.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q/A  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2019  
Document Transition Report false  
Entity File Number 001-36473  
Entity Registrant Name Trinseo S.A.  
Entity Incorporation, State or Country Code N4  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One 1000 Chesterbrook Boulevard  
Entity Address, Address Line Two Suite 300  
Entity Address, City or Town Berwyn  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19312  
City Area Code 610  
Local Phone Number 240-3200  
Title of 12(b) Security Ordinary Shares, par value $0.01 per share  
Trading Symbol tse  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   39,179,801
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001519061  
Current Fiscal Year End Date --12-31  
Amendment Flag false