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Document and Entity Information Document
 12 Months Ended
Dec. 31, 2020
Entity Information [Line Items]  
Entity Registrant Name ALAMOS GOLD INC
Entity Central Index Key 0001178819
Document Type 40-F
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Amendment Flag false
Document Period End Date Dec. 31, 2020
Entity Address, Address Line One Brookfield Place, 181 Bay Street, Suite 3910
Entity Address, City or Town Toronto
Entity Address, State or Province ON
Entity Address, Country CA
Entity Address, Postal Zip Code M5J 2T3
City Area Code 416
Local Phone Number 368-9932
Entity Interactive Data Current Yes
Entity Current Reporting Status Yes
Entity Emerging Growth Company false
Annual Information Form true
Audited Annual Financial Statements true
Entity File Number 001-35783
Entity Incorporation, State or Country Code A6
Document Annual Report true
Document Registration Statement false
Business Contact  
Entity Information [Line Items]  
Entity Address, Address Line One 1114 Avenue of the Americas
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10036
City Area Code 212
Local Phone Number 880-6000
Contact Personnel Name Mile T. Kurta