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Share capital (Tables)
 12 Months Ended
Dec. 31, 2022
Disclosure of classes of share capital [abstract]  
Schedule of common shares issued and outstanding (a) No par value common shares issued    

Number of sharesValue of shares
(in millions of U.S. dollars, except where noted)(000s)$
NO PAR VALUE COMMON SHARES ISSUED


Balance at December 31, 2020680,250 3,154.0 
Issuance of common shares under First Nations agreements250 0.4 
Exercise of options and vested performance share units646 1.0 
Balance at December 31, 2021681,146 3,155.4 
Issuance of common shares under First Nations agreements375 0.5 
Exercise of options and vested performance share units755 1.2 
Balance at December 31, 2022682,277 3,157.1 
Schedule of share-based payment arrangements
The following table summarizes share-based payment expenses:

Year ended December 31
(in millions of U.S. dollars)20222021
SHARE-BASED PAYMENT EXPENSES


Stock option expense 1.2 1.1 
Performance share unit expense0.5 1.6 
Restricted share unit expense(1)
2.1 1.4 
Deferred share unit expense(0.4)(0.7)
Shares issued under First Nations agreements(1)
0.4 (0.1)
Total share-based payment expenses3.8 3.3 
1. For the year ended December 31, 2022 $1.2 million of share based expenses were recognized in operating expenses (2021 – $1.1 million).
Schedule of number and weighted average exercise prices of share options The following table presents changes in the Company’s stock option plan:

Number of optionsWeighted average
exercise price

(000s)C$/share
CHANGES TO THE COMPANY'S STOCK OPTION PLAN


Balance at December 31, 20204,835 1.59 
Granted1,708 2.06 
Exercised(203)1.18 
Forfeited(339)2.00 
Expired(245)4.82 
Balance at December 31, 20215,756 1.58 
Granted1,291 2.18 
Exercised(755)1.17 
Forfeited(1,213)1.98 
Expired(228)3.89 
Balance at December 31, 20224,851 1.59 
Schedule of earnings per share The following table sets out the calculation of earnings (loss) per share:

Year ended December 31
(in millions of U.S. dollars, except where noted)20222021
CALCULATION OF EARNINGS (LOSS) PER SHARE


Net (loss) earnings (66.8)140.6 
Basic weighted average number of shares outstanding
(in millions)
681.9 680.8 
Dilution of securities:

Stock options— 1.6 
Diluted weighted average number of shares outstanding
(in millions)
681.9 682.4 
Net (loss) earnings per share:

Basic(0.10)0.21 
Diluted(0.10)0.21 
Schedule of antidilutive securities excluded from computation of earnings per share The following table lists the equity securities excluded from the calculation of diluted earnings per share. All stock options are excluded from the calculation when the Company is in a net loss position.

Year ended December 31
(in millions of units)20222021
EQUITY SECURITIES EXCLUDED FROM THE CALCULATION OF
DILUTED EARNINGS PER SHARE


Stock options4.9 1.9