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Capital Stock - Capital Transactions (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of classes of share capital [line items] |  |  |
Proceeds from exercise of options | $ 400,000 | $ 13,600,000 | $ 4,100,000
Subordinate Voting Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares issued, beginning balance | 123,200,000 | 121,900,000 | 124,500,000
Number of shares outstanding, beginning balance | 123,200,000 | 121,900,000 | 124,500,000
Issued from treasury (in shares) | 1,300,000 | 2,800,000 | 600,000
Cancelled under NCIB (in shares) | (6,800,000) | (1,900,000) | (3,200,000)
Other (in shares) | 0 | 346,175 | 0
Number of shares issued, ending balance | 117,700,000 | 123,200,000 | 121,900,000
Number of shares outstanding, ending balance | 117,700,000 | 123,200,000 | 121,900,000
Multiple Voting Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares issued, beginning balance | 18,600,000 | 18,900,000 | 18,900,000
Number of shares outstanding, beginning balance | 18,600,000 | 18,900,000 | 18,900,000
Issued from treasury (in shares) | 0 | 0 | 0
Cancelled under NCIB (in shares) | 0 | 0 | 0
Other (in shares) |  | (350,000) |
Number of shares issued, ending balance | 18,600,000 | 18,600,000 | 18,900,000
Number of shares outstanding, ending balance | 18,600,000 | 18,600,000 | 18,900,000
Options | Subordinate Voting Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares issued upon exercise of employee stock options | 100,000 | 1,700,000 | 600,000
RSUs | Subordinate Voting Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares issued upon exercise of employee stock options | 1,200,000 | 1,100,000 | 0
Value of shares issued upon vesting of RSUs | $ 14,300,000 | $ 9,800,000 | $ 0

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