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Shareholders' equity (Tables)

12 Months Ended

Dec. 31, 2019

Shareholders' equity

Schedule of changes in share capital


			Number
			of shares			Amount
Balance at January 1, 2018			185,930,331		$	5,107.8
Exercise of stock options			94,018			5.5
Vesting of restricted share units			52,882			3.3
Dividend reinvestment plan (Note 15(c))			615,250			41.7
Balance at December 31, 2018			186,692,481		$	5,158.3
At-the-market equity offering (Note 15(b))			1,433,400			136.0
Acquisition of Salares Norte (Note 3(e))			366,499			27.0
Exercise of stock options			283,863			17.3
Vesting of restricted share units			46,375			3.3
Dividend reinvestment plan (Note 15(c))			558,770			48.8
Balance at December 31, 2019			189,381,388		$	5,390.7

Schedule of dividends paid


			2019				2018
Cash dividends			$	138.2			$	136.1
DRIP dividends				48.8				41.7
			$	187.0			$	177.8

Schedule of options to purchase common shares that have been granted


			2019						2018
					Weighted						Weighted
					average exercise						average exercise
			Number		price				Number		price
Stock options outstanding, beginning of year			1,015,409		C$	69.13			955,603		C$	64.48
Granted			104,881		C$	129.32			153,824		C$	92.77
Exercised			(283,863)		C$	59			(94,018)		C$	60.49
Stock options outstanding, end of the year			836,427		C$	80.01			1,015,409		C$	69.13

Exercisable stock options, end of the year			596,402		C$	68.05			710,064		C$	60.40

Schedule of fair value of options calculated using Black-Scholes option pricing model and weighted average assumptions utilized


			2019			2018
Risk-free interest rate			1.62	%		2.05	%
Expected dividend yield			1.02	%		1.38	%
Expected price volatility of the Company’s common shares			27.5	%		32.7	%
Expected life of the option			4 years			5 years
Forfeiture rate			0	%		0	%

Schedule of options to purchase common shares outstanding, exercise prices and weighted average lives to maturity


							Weighted
	Exercise		Options		Options		average life
	price		outstanding		exercisable		(years)
	C$33.12		1,500		1,500		0.90
	C$40.87		38,076		38,076		3.95
	C$42.43		2,000		2,000		2.25
	C$46.17		90,000		90,000		3.63
	C$55.58		27,397		27,397		2.95
	C$58.67		35,000		35,000		5.64
	C$59.52		53,376		53,376		4.95
	C$65.76		65,258		65,258		5.95
	C$75.45		178,936		178,936		6.95
	C$88.76		45,082		13,261		8.64
	C$94.57		98,562		27,835		8.95
	C$100.10		96,359		63,763		7.95
	C$129.32		104,881		—		9.95
			836,427		596,402		6.86

Schedule of share purchase warrants


			2019			2018
Common shares outstanding			189,381,388			186,692,481
Stock options			836,427			1,015,409
Restricted Share Units			108,978			115,337
			190,326,793			187,823,227