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Share Capital (Stock Options) (Details)
 12 Months Ended
Dec. 31, 2017
CAD
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
CAD
shares
Dec. 31, 2016
USD ($)
shares
Disclosure of share capital, reserves and other equity interest [Abstract]        
Number of options outstanding 9,511,636 9,511,636 10,237,362 10,237,362
Granted 578,490 578,490 1,620,000 1,620,000
Conversion shares 2,863,146 2,863,146 462,954 462,954
Exercised (510,673) (510,673) (1,099,749) (1,099,749)
Expired (2,013,254) (2,013,254) (1,708,931) (1,708,931)
Number of options outstanding 10,429,345 10,429,345 9,511,636 9,511,636
Weighted average exercise price of share options outstanding (CAD$) | CAD CAD 10.87   CAD 12.15  
Weighted average exercise price of share options granted (CAD$) | $   $ 9.62   $ 3.75
Weighted average exercise price of share options conversion of Carlisle options to Alamos (CAD$) | $   3.53   9.69
Weighted average exercise price of share options exercised (CAD$) | $   $ 6.23   $ 7.63
Weighted average exercise price of share options expired (CAD$) | CAD 16.42   13.56  
Weighted average exercise price of share options outstanding (CAD$) | CAD 7.94   10.87  
Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise (CAD$) | CAD CAD 9.99   CAD 11.37