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Shareholders' equity - Share Purchase Warrants and Deferred share unit plan (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2017 USD ($) EquityInstruments shares | Dec. 31, 2016 USD ($) EquityInstruments shares
Stock-based payments |  |  |
Proceeds from exercise of warrants | $ |  | $ 356.4 |
Share Purchase Warrants |  |  |
Stock-based payments |  |  |
Warrants outstanding, beginning of the year |  | 6,510,280 | 6,510,769
Exercised |  | (6,388,528) | (489)
Forfeited |  | (121,752) |
Warrants outstanding, end of the year |  |  | 6,510,280
Warrants exercise price | $ / shares | $ 75.00 |  |
Proceeds from exercise of warrants | $ |  | $ 356.4 |
Common shares issued from exercise of stock warrants |  | 6,388,528 |
DSU plan |  |  |
Stock-based payments |  |  |
Granted | EquityInstruments |  | 19,632 | 19,209
DSU liability | $ | $ 6.7 | $ 6.7 | $ 3.8
Mark-to-market adjustments | $ |  | $ 1.6 | $ 0.2

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- Definition The exercise price of warrants. + References No definition available. + Details
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