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STOCK BASED COMPENSATION - Stock options exercisable (Details) - Stock options $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 23, 2018 Options shares | Dec. 31, 2017 CAD ($) Options Y shares | Dec. 31, 2017 USD ($) Options Y shares | Dec. 31, 2016 USD ($) Options Y shares | Dec. 31, 2016 CAD ($) Options shares | Dec. 31, 2015 CAD ($) Options
Share based compensation |  |  |  |  |  |
Number of stock options granted | Options |  |  | 2,018,140 | 2,160,075 |  |
Number of stock options vested within 30 days of grant date | shares |  |  | 499,796 | 540,027 |  |
Vesting period |  |  | 3 years |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Number of stock options outstanding | Options |  | 5,857,504 |  |  | 5,478,837 | 12,082,212
Weighted average remaining contractual life of excercisable stock options |  | 2 years 2 months 1 day |  |  |  |
Weighted average exercise price of outstanding stock options |  | $ 41.18 |  |  | $ 34.40 | $ 43.65
Number of exercisable stock options | Options |  | 2,628,998 |  |  | 1,606,558 |
Weighted average exercise price of exercisable stock options |  | $ 37.66 |  |  | $ 40.27 |
Common stock reserved for future issuance | shares |  | 5,857,504 |  |  |  |
Number of common shares available for grant | shares |  | 4,371,663 |  |  | 6,289,059 |
Significant assumptions used to estimate the fair value of stock options |  |  |  |  |  |
Risk-free interest rate |  |  | 1.15% | 0.89% |  |
Expected life of stock options (in years) | Y |  |  | 2.3 | 2.5 |  |
Expected volatility (as a percent) |  |  | 45.00% | 45.00% |  |
Expected dividend yield |  |  | 1.09% | 1.33% |  |
Total compensation expense recorded in the general and administrative |  |  | $ 19.5 | $ 16.6 |  |
Share based compensation cost capitalized as part of the property, plant and mine development |  |  | $ 0.3 | $ 0.3 |  |
Subsequent events |  |  |  |  |  |
Share based compensation |  |  |  |  |  |
Number of stock options granted | Options | 1,990,850 |  |  |  |  |
Number of stock options vested within 30 days of grant date | shares | 496,973 |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Exercise price range 28.03 to 38.15 |  |  |  |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Number of stock options outstanding | Options |  | 3,638,052 |  |  |  |
Weighted average remaining contractual life of outstanding stock options | Y |  | 2.30 |  |  |  |
Weighted average exercise price of outstanding stock options |  | $ 32.10 |  |  |  |
Number of exercisable stock options | Options |  | 1,903,646 |  |  |  |
Weighted average exercise price of exercisable stock options |  | $ 31.05 |  |  |  |
Exercise price range 40.66 to 66.57 |  |  |  |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Number of stock options outstanding | Options |  | 2,219,452 |  |  |  |
Weighted average remaining contractual life of outstanding stock options | Y |  | 3.52 |  |  |  |
Weighted average exercise price of outstanding stock options |  | $ 56.05 |  |  |  |
Number of exercisable stock options | Options |  | 725,352 |  |  |  |
Weighted average exercise price of exercisable stock options |  | $ 55.01 |  |  |  |
Exercise price range 28.03 to 66.57 |  |  |  |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Number of stock options outstanding | Options |  | 5,857,504 |  |  |  |
Weighted average remaining contractual life of outstanding stock options | Y |  | 2.76 |  |  |  |
Weighted average exercise price of outstanding stock options |  | $ 41.18 |  |  |  |
Number of exercisable stock options | Options |  | 2,628,998 |  |  |  |
Weighted average exercise price of exercisable stock options |  | $ 37.66 |  |  |  |
Minimum | Exercise price range 28.03 to 38.15 |  |  |  |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Range of exercise prices |  | 28.03 |  |  |  |
Minimum | Exercise price range 40.66 to 66.57 |  |  |  |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Range of exercise prices |  | 40.66 |  |  |  |
Minimum | Exercise price range 28.03 to 66.57 |  |  |  |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Range of exercise prices |  | 28.03 |  |  |  |
Maximum | Exercise price range 28.03 to 38.15 |  |  |  |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Range of exercise prices |  | 38.15 |  |  |  |
Maximum | Exercise price range 40.66 to 66.57 |  |  |  |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Range of exercise prices |  | 66.57 |  |  |  |
Maximum | Exercise price range 28.03 to 66.57 |  |  |  |  |  |
Range of exercise prices and number and weighted average remaining contractual life of stock options |  |  |  |  |  |
Range of exercise prices |  | $ 66.57 |  |  |  |

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