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Consolidated Statements of Changes in Equity - USD ($) | Total | Share capital [Member] | Contributed Surplus [member] | Warrants [member] | Accumulated other comprehensive income (loss) [member] | Accumulated other comprehensive income (loss) [member] Equity securities [member] | Accumulated other comprehensive income (loss) [member] Currency hedging instruments [member] | Deficit [member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 |  | $ 2,773,700,000 | $ 69,200,000 | $ 0 |  | $ (4,400,000) | $ 0 | $ (1,114,300,000)
Changes in equity [abstract] |  |  |  |  |  |  |  |
Issuance of shares related to Richmont acquisition (note 5) |  | 0 |  |  |  |  |  |
Issuance of shares through bought deal financing, net of issuance costs and deferred taxes |  | 0 |  |  |  |  |  |
Issuance of shares related to Carlisle acquisition |  | 17,500,000 |  |  |  |  |  |
Issuance of shares related to share-based compensation |  | 7,400,000 | 0 |  |  |  |  |
Issuance of shares related to exercise of warrants |  | 1,200,000 |  |  |  |  |  |
Issuance of shares through flow-through share agreements |  | 20,100,000 |  |  |  |  |  |
Share-based compensation |  |  | 4,400,000 |  |  |  |  |
Fair value of share-based compensation redeemed |  | 2,300,000 | (3,100,000) |  |  |  |  |
Shares issued related to the merger (note x) |  |  | 0 |  |  |  |  |
Equity settled share-based payments related to Carlisle acquisition |  |  | 400,000 |  |  |  |  |
Issuance of warrants related to Carlisle acquisition |  |  |  | 2,800,000 |  |  |  |
Issuance of warrants, pursuant to the exercise of Carlisle equity instruments |  |  |  | 700,000 |  |  |  |
Realized disposition on equity securities, reclassified to net loss | $ (300,000) |  |  |  |  | (300,000) |  |
Unrealized gains on equity securities, net of taxes | 5,100,000 |  |  |  |  | 5,100,000 |  |
Unrealized gain on currency hedging instruments, net of taxes | 0 |  |  |  |  |  | 0 |
Dividends (note13(f)) |  |  |  |  |  |  |  | (5,400,000)
Net earnings (loss) | (17,900,000.0) |  |  |  |  |  |  | (17,900,000)
Ending balance at Dec. 31, 2016 | 1,759,400,000 | 2,822,200,000 | 70,900,000 | 3,500,000 | $ 400,000 | 400,000 | 0 | (1,137,600,000)
Changes in equity [abstract] |  |  |  |  |  |  |  |
Issuance of shares related to Richmont acquisition (note 5) |  | 615,300,000 |  |  |  |  |  |
Issuance of shares through bought deal financing, net of issuance costs and deferred taxes |  | 241,800,000 |  |  |  |  |  |
Issuance of shares related to Carlisle acquisition |  | 0 |  |  |  |  |  |
Issuance of shares related to share-based compensation |  | 2,300,000 | 1,300,000 |  |  |  |  |
Issuance of shares related to exercise of warrants |  | 500,000 |  |  |  |  |  |
Issuance of shares through flow-through share agreements |  | 8,400,000 |  |  |  |  |  |
Share-based compensation |  |  | 6,400,000 |  |  |  |  |
Fair value of share-based compensation redeemed |  | 1,200,000 | (1,200,000) |  |  |  |  |
Shares issued related to the merger (note x) |  |  | 12,100,000 |  |  |  |  |
Equity settled share-based payments related to Carlisle acquisition |  |  | 0 |  |  |  |  |
Issuance of warrants related to Carlisle acquisition |  |  |  | 0 |  |  |  |
Issuance of warrants, pursuant to the exercise of Carlisle equity instruments |  |  |  | 500,000 |  |  |  |
Realized disposition on equity securities, reclassified to net loss | 0 |  |  |  |  | 0 |  |
Unrealized gains on equity securities, net of taxes | 0 |  |  |  |  | 6,600,000 |  |
Unrealized gain on currency hedging instruments, net of taxes | 6,000,000 |  |  |  |  |  | 6,000,000 |
Dividends (note13(f)) |  |  |  |  |  |  |  | (6,000,000)
Net earnings (loss) | 26,600,000 |  |  |  |  |  |  | 26,600,000
Ending balance at Dec. 31, 2017 | $ 2,681,200,000 | $ 3,691,700,000 | $ 89,500,000 | $ 4,000,000 | $ 13,000,000 | $ 7,000,000 | $ 6,000,000 | $ (1,117,000,000)

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