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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 25, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38403    
Entity Registrant Name CRONOS GROUP INC.    
Entity Incorporation, State or Country Code Z4    
Entity Address, Address Line One 111 Peter St., Suite 300    
Entity Address, City or Town Toronto    
Entity Address, State or Province ON    
Entity Address, Postal Zip Code M5V 2H1    
City Area Code 416    
Local Phone Number 504-0004    
Title of 12(b) Security Common Shares, no par value    
Trading Symbol CRON    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
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    
Entity Shell Company false    
Entity Public Float     $ 1,099,685,039
Entity Common Stock, Shares Outstanding (in shares)   360,258,680  
Documents Incorporated by Reference Certain information required by Part III of this Annual Report on Form 10-K will either be incorporated into this Annual Report on Form 10-K by reference to the registrant’s definitive proxy statement for its 2021 Annual Meeting of Shareholders, or will be included in an amendment to this Annual Report on Form 10-K to be filed no later than 120 days after the registrant's fiscal year ended December 31, 2020.    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001656472