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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018

2017

2016

Share capital, January 1
144.9

146.3

153.0

CP Common Shares repurchased
(4.6
)
(1.9
)
(6.9
)
Shares issued under stock option plan
0.2

0.5

0.2

Share capital, December 31
140.5

144.9

146.3
Activities Under Shares Repurchase Programs The following table provides the activities under the share repurchase programs:
 
2018

2017

2016

Number of Common Shares repurchased(1)
4,683,162

1,888,100

6,910,000

Weighted-average price per share(2)
$
240.68

$
201.53

$
175.08

Amount of repurchase (in millions)(2)
$
1,127

$
381

$
1,210

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