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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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The number of stock options vested within 30 days from grant date in share-based payment arrangement.

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The vesting life of awards in a share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average remaining contractual life of exercisable share options.

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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.

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The option life of share options granted.

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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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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The exercise price of outstanding share options.

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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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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 number of share options granted 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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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