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Capital Stock - Schedule of Share-based Compensation, Stock Options, Activity (Details) - Employee Stock Option [Member] - $ / shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding, beginning of period 5,732,209 5,465,046
Granted   1,016,882
Exercised   (86,337)
Forfeited (23,633) (329,346)
Expired (772,665) (299,134)
Cancelled (18,483) (26,281)
Stock options outstanding, end of period 4,917,428 5,740,830
Stock options exercisable, end of period 4,315,484 4,511,208
Stock options outstanding, weighted average exercise price per share $ 26.82 $ 27.63
Granted, weighted average exercise price per share   20.66
Exercised, weighted average exercise price per share   20.15
Forfeited, weighted average exercise price per share 22.35 23.60
Expired, weighted average exercise price per share 27.03 25.82
Cancelled, weighted average exercise price per share 27.97 31.08
Stock options outstanding, weighted average exercise price per share 26.80 26.82
Stock options exercisable, weighted average exercise price per share, end of period $ 27.32 $ 27.76