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Share Capital (Stock Options) (Details) | 12 Months Ended
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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 |

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