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Shareholders' equity (Tables)

12 Months Ended

Dec. 31, 2020

Shareholders' equity

Schedule of changes in share capital


			Number
			of shares			Amount
Balance at January 1, 2019			186,692,481		$	5,158.3
At-the-market equity offering			1,433,400			136.0
Acquisition of Salares Norte			366,499			27.0
Exercise of stock options			283,863			17.3
Vesting of restricted share units			46,375			3.3
Dividend reinvestment plan			558,770			48.8
Balance at December 31, 2019			189,381,388		$	5,390.7
At-the-market equity offering			1,054,800		$	133.7
Exercise of stock options			150,482			9.7
Vesting of restricted share units			42,328			3.7
Dividend reinvestment plan			327,478			42.3
Balance at December 31, 2020			190,956,476		$	5,580.1

Schedule of dividends paid


			2020				2019
Cash dividends			$	154.9			$	138.2
DRIP dividends				42.3				48.8
			$	197.2			$	187.0

Schedule of options to purchase common shares that have been granted


			2020						2019
					Weighted						Weighted
					average exercise						average exercise
			Number		price				Number		price
Stock options outstanding, beginning of year			836,427		C$	80.01			1,015,409		C$	69.13
Granted			61,594		C$	171.33			104,881		C$	129.32
Exercised			(150,482)		C$	67.13			(283,863)		C$	59.31
Forfeited			(1,577)		C$	112.84			—		C$	—
Stock options outstanding, end of the year			745,962		C$	90.08			836,427		C$	80.01

Exercisable stock options, end of the year			563,975		C$	76.14			596,402		C$	68.05

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


			2020			2019
Risk-free interest rate			0.39	%		1.62	%
Expected dividend yield			0.78	%		1.02	%
Expected price volatility of the Company’s common shares			28.8	%		27.5	%
Expected life of the option			4 years			4 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$40.87		32,451		32,451		2.94
	C$42.43		750		750		1.25
	C$46.17		75,000		75,000		2.63
	C$55.58		17,397		17,397		1.95
	C$58.67		20,000		20,000		4.64
	C$59.52		33,876		33,876		3.95
	C$65.76		55,853		55,853		4.94
	C$75.45		120,074		120,074		5.94
	C$88.76		45,082		29,171		7.64
	C$94.57		95,273		60,184		7.95
	C$100.10		84,523		84,523		6.94
	C$129.32		104,089		34,696		8.94
	C$171.33		61,594		—		9.94
			745,962		563,975		6.40

Schedule of share purchase warrants


			2020			2019
Common shares outstanding			190,956,476			189,381,388
Stock options			745,962			836,427
Restricted Share Units			102,708			108,978
			191,805,146			190,326,793