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Cover Page - shares
 6 Months Ended
Jun. 30, 2020
Aug. 05, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2020  
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 2G9  
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 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 (in shares)   349,886,402
Amendment Flag false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001656472  
Current Fiscal Year End Date --12-31