Share Capital - Schedule Of Weighted Average Shares Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Weighted average number of common and exchangeable shares outstanding (in shares)	376,495,306	390,930,453	396,683,593
Shares issuable pursuant to stock options (in shares)	87,204	4,207,542	0
Shares assumed to be purchased from proceeds of stock options (in shares)	(74,698)	(3,832,516)	0
Shares issuable on conversion of Convertible Notes (in shares)	0	35,814,393	0
Weighted average number of diluted common and exchangeable shares outstanding (in shares)	376,507,812	427,119,872	396,683,593