Aggregate number of common shares reserved for future issuance.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

n/a

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No definition available.

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- Definition

The weighted average remaining contractual life of exercisable share options.

+ References

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The option life of share options granted.

+ References

+ Details

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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]]

+ References

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- Definition

The exercise price of outstanding share options.

+ References

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- Definition

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

+ References

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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- Definition

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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- Definition

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

+ References

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
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- Definition

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) - Ifrs Employee Stock Option [Member] $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Y	Dec. 31, 2019 USD ($) Y	Dec. 31, 2020 Options $ / shares shares	Dec. 31, 2019 Options $ / shares	Dec. 31, 2018 Options $ / shares
Range of exercise prices and number and weighted average remaining contractual life of stock options
Number of stock options outstanding \| Options			3,421,404	4,122,300	6,361,265
Weighted average exercise price of outstanding stock options			$ 65.27	$ 54.86	$ 47.65
Number of exercisable stock options \| Options			852,588	1,195,730
Weighted average exercise price of exercisable stock options			$ 60.61	$ 51.39
Common stock reserved for future issuance \| shares			3,421,404
Number of common shares available for grant \| shares			3,602,050
Significant assumptions used to estimate the fair value of stock options
Risk-free interest rate	1.90%	2.23%
Expected life of stock options (in years) \| Y	2.4	2.4
Expected volatility (as a percent)	27.50%	30.00%
Expected dividend yield	1.20%	1.20%
Total compensation expense recorded in the general and administrative \| $	$ 15.9	$ 16.8
Share based compensation cost capitalized as part of the property, plant and mine development \| $	$ 0.0	$ 0.7
Exercise Price Range 36.37 To 58.04
Range of exercise prices and number and weighted average remaining contractual life of stock options
Number of stock options outstanding \| Options			2,113,592
Weighted average remaining contractual life of outstanding share options	2 years 5 months 12 days
Weighted average exercise price of outstanding stock options			$ 56.13
Number of exercisable stock options \| Options			699,588
Weighted average remaining contractual life of exercisable stock options	1 year 11 months 23 days
Weighted average exercise price of exercisable stock options			$ 56.35
Exercise Price Range 79.98 to 84.12
Range of exercise prices and number and weighted average remaining contractual life of stock options
Number of stock options outstanding \| Options			1,307,812
Weighted average remaining contractual life of outstanding share options	4 years 4 days
Weighted average exercise price of outstanding stock options			$ 80.05
Number of exercisable stock options \| Options			153,000
Weighted average remaining contractual life of exercisable stock options	4 years 7 days
Weighted average exercise price of exercisable stock options			$ 80.13
Exercise Price Range 36.37 To 84.12
Range of exercise prices and number and weighted average remaining contractual life of stock options
Number of stock options outstanding \| Options			3,421,404
Weighted average remaining contractual life of outstanding share options	3 years 18 days
Weighted average exercise price of outstanding stock options			$ 65.27
Number of exercisable stock options \| Options			852,588
Weighted average remaining contractual life of exercisable stock options	2 years 4 months 6 days
Weighted average exercise price of exercisable stock options			$ 60.61
Minimum \| Exercise Price Range 36.37 To 58.04
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			36.37
Minimum \| Exercise Price Range 79.98 to 84.12
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			79.98
Minimum \| Exercise Price Range 36.37 To 84.12
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			36.37
Maximum \| Exercise Price Range 36.37 To 58.04
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			58.04
Maximum \| Exercise Price Range 79.98 to 84.12
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			84.12
Maximum \| Exercise Price Range 36.37 To 84.12
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			$ 84.12