v3.26.1
Cover
Mar. 19, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Mar. 19, 2026
Entity File Number 001-36473
Entity Registrant Name Trinseo PLC
Entity Central Index Key 0001519061
Entity Tax Identification Number 00-0000000
Entity Incorporation, State or Country Code L2
Entity Address, Address Line One 440 East Swedesford Road
Entity Address, Address Line Two Suite 301
Entity Address, City or Town Wayne
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19087
City Area Code 610
Local Phone Number 240-3200
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Ordinary Shares, par value $0.01 per share
Trading Symbol TSE
Security Exchange Name NYSE
Entity Emerging Growth Company false