Aggregate number of common shares reserved for future issuance.

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Range of exercise prices and number and weighted average remaining contractual life of stock options.

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No definition available.

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Expense from share-based payment transactions in which goods or services received qualify for recognition as assets in property, plant and mine development.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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No definition available.

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- Definition

n/a

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No definition available.

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The weighted average remaining contractual life of exercisable share options.

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No definition available.

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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

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The option life of share options granted.

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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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The exercise price of outstanding share options.

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- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

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The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets.

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- Definition

The number of share options outstanding in a share-based payment arrangement.

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The number of share options exercisable in a share-based payment arrangement.

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The weighted average exercise price of share options exercisable in a share-based payment arrangement. [Refer: Weighted average [member]]

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The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]]

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The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]]

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STOCK-BASED COMPENSATION - Stock options exercisable (Details) - Stock options $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Y	Dec. 31, 2017 USD ($) Y	Dec. 31, 2018 CAD ($) Options Y shares	Dec. 31, 2017 CAD ($) Options	Dec. 31, 2016 CAD ($) Options
Range of exercise prices and number and weighted average remaining contractual life of stock options
Number of stock options outstanding \| Options			6,361,265	5,857,504	5,478,837
Weighted average exercise price of outstanding stock options			$ 47.65	$ 41.18	$ 34.40
Number of exercisable stock options \| Options			3,429,813	2,628,998
Weighted average exercise price of exercisable stock options			$ 42.28	$ 37.66
Common stock reserved for future issuance \| shares			6,361,265
Number of common shares available for grant \| shares			7,046,981
Significant assumptions used to estimate the fair value of stock options
Risk-free interest rate	2.10%	1.15%
Expected life of stock options (in years) \| Y	2.4	2.3
Expected volatility (as a percent)	35.00%	45.00%
Expected dividend yield	1.00%	1.09%
Total compensation expense recorded in the general and administrative	$ 19.8	$ 19.5
Share based compensation cost capitalized as part of the property, plant and mine development	$ 0.5	$ 0.3
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			2,544,126
Weighted average remaining contractual life of outstanding stock options \| Y			1.55
Weighted average exercise price of outstanding stock options			$ 33.07
Number of exercisable stock options \| Options			2,052,333
Weighted average remaining contractual life of exercisable stock options \| Y			1.44
Weighted average exercise price of exercisable stock options			$ 32.28
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			3,817,139
Weighted average remaining contractual life of outstanding stock options \| Y			3.52
Weighted average exercise price of outstanding stock options			$ 57.37
Number of exercisable stock options \| Options			1,377,480
Weighted average remaining contractual life of exercisable stock options \| Y			3.36
Weighted average exercise price of exercisable stock options			$ 57.18
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			6,361,265
Weighted average remaining contractual life of outstanding stock options \| Y			2.73
Weighted average exercise price of outstanding stock options			$ 47.65
Number of exercisable stock options \| Options			3,429,813
Weighted average remaining contractual life of exercisable stock options \| Y			2.21
Weighted average exercise price of exercisable stock options			$ 42.28
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