Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Feb. 12, 2026	Jun. 30, 2025
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-36563
Entity Registrant Name	ORION S.A.
Entity Incorporation, State or Country Code	N4
Entity Tax Identification Number	00-0000000
Entity Address, Address Line One	1700 City Plaza Drive, Suite 300
Entity Address, City or Town	Spring
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77389
City Area Code	281
Local Phone Number	318-2959
Title of 12(b) Security	Common Stocks, no par value
Trading Symbol	OEC
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 590
Entity Common Stock, Shares Outstanding		56,273,701
Documents Incorporated by Reference	Portions of the Company’s 2026 Proxy Statement, in connection with the Company’s 2026 Annual Meeting of Shareholders (in Part III), as indicated herein.
Entity Central Index Key	0001609804
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false