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Capital Stock - Capital Transactions (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of classes of share capital [line items] |  |  |
Proceeds from exercise of options | $ 13,600,000 | $ 4,100,000 | $ 3,900,000
Subordinate Voting Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares issued, beginning balance | 121,900,000 | 124,500,000 | 155,600,000
Number of shares outstanding, beginning balance | 121,900,000 | 124,500,000 | 155,600,000
Issued from treasury (in shares) | 2,800,000 | 600,000 | 1,300,000
Cancelled under NCIB (in shares) | (1,900,000) | (3,200,000) | (32,400,000)
Other (in shares) | 346,175 |  |
Number of shares issued, ending balance | 123,200,000 | 121,900,000 | 124,500,000
Number of shares outstanding, ending balance | 123,200,000 | 121,900,000 | 124,500,000
Multiple Voting Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares issued, beginning balance | 18,900,000 | 18,900,000 | 18,900,000
Number of shares outstanding, beginning balance | 18,900,000 | 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 | 18,900,000 | 18,900,000
Number of shares outstanding, ending balance | 18,600,000 | 18,900,000 | 18,900,000
Options | Subordinate Voting Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares issued upon exercise of employee stock options | 1,700,000 | 600,000 | 500,000
RSUs | Subordinate Voting Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares issued upon exercise of employee stock options | 1,100,000 | 0 | 800,000
Value of shares issued upon vesting of RSUs | $ 9,800,000 | $ 0 | $ 6,500,000

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