Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Activities Under Share Repurchase Program

The following table describes activities under the share repurchase program:

	For the three months ended September 30				For the nine months ended September 30
	2018		2017		2018		2017
Number of Common Shares repurchased	—		1,145,400		2,495,962		1,828,300
Weighted-average price per share(1)	$	—	$	196.46	$	223.97	$	201.50
Amount of repurchase (in millions)(1)	$	—	$	225	$	559	$	368

⁽¹⁾ Includes brokerage fees.

On October 17, 2018, the Company announced that it intends to implement a new NCIB to repurchase, for cancellation, up to approximately 5.68 million of its Common Shares, subject to Toronto Stock Exchange acceptance.