Shareholders' equity (Tables)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Summary of Information Related to Common Share Balances

The following table summarizes information related to Common Share balances as at December 31:

(number of shares in millions)	2022	2021	2020
Share capital, January 1	929.7	666.3	685.0
Common Shares repurchased	—	—	(20.4)
Shares issued under stock option plan	0.8	0.8	1.7
Shares issued for KCS acquisition (Note 10)	—	262.6	—
Share capital, December 31	930.5	929.7	666.3

Activities Under the Share Repurchase Programs

The following table provides activities under the share repurchase programs for each of the years ended December 31:

	2022		2021		2020
Number of Common Shares repurchased(1)	—		—		19,865,380
Weighted-average price per share(2)	$	—	$	—	$	74.35
Amount of repurchase (in millions)(2)	$	—	$	—	$	1,477

(1) Includes shares repurchased but not yet cancelled at year end.

(2) Includes brokerage fees.