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ACQUISITIONS - Disposal of interest (Details) shares in Millions, $ in Millions, $ in Millions |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 03, 2017 CAD ($) | Nov. 03, 2017 USD ($) | Sep. 18, 2017 | Jun. 14, 2017 CAD ($) item shares | Jun. 14, 2017 USD ($) item shares | Jun. 09, 2017 USD ($) | May 18, 2017 | Mar. 28, 2017 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Acquisitions |  |  |  |  |  |  |  |  |  |
Gross cash proceeds |  |  |  |  |  |  |  |  |  | $ 269.6
Reversal of impairment charges |  |  |  |  |  |  |  |  |  | 97.0
Gains on disposals of investments |  |  |  |  |  | $ 12.7 |  |  | $ 2.1 | 55.2
Goldcorp Inc. ("Goldcorp") |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Gross cash proceeds |  |  |  |  |  | $ 260.0 |  |  |  |
Royalty percentage |  |  |  |  |  | 1.25% |  |  |  |
Percentage of gross revenues |  |  |  |  |  | 25.00% |  |  |  |
Foregoing revenue |  |  |  |  |  | $ 10.0 |  |  |  |
White Gold Corp |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Gross cash proceeds |  |  |  | $ 10.0 | $ 7.6 |  |  |  |  |
Number of shares received | shares |  |  |  | 17.5 | 17.5 |  |  |  |  |
Percentage of common shares |  |  |  | 19.90% | 19.90% |  |  |  |  |
Deferred payments |  |  |  | $ 15.0 | $ 11.4 |  |  |  |  |
Number of equal payments | item |  |  |  | 3 | 3 |  |  |  |  |
Amount of equal payments |  |  |  | $ 5.0 | $ 3.8 |  |  |  |  |
Losses on disposals of investments |  |  |  |  | $ 1.7 |  |  |  |  |
Integra |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Period for non-interest bearing promissory note due | 18 months | 18 months |  |  |  |  |  |  |  |
Total consideration | $ 7.2 | $ 5.6 |  |  |  |  |  |  |  |
Percentage of common shares | 9.90% | 9.90% |  |  |  |  |  |  |  |
Percentage of net smelter return royalty | 2.50% | 2.50% |  |  |  |  |  |  |  |
Maximum percentage of net smelter return royalty | 1.00% | 1.00% |  |  |  |  |  |  |  |
Accumulated royalty payments | $ 10.0 | $ 7.8 |  |  |  |  |  |  |  |
Gains on disposals of investments |  | $ 44.2 |  |  |  |  |  |  |  |
Barrick | Goldcorp Inc. ("Goldcorp") |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Contingent payment |  |  |  |  |  | 20.0 |  |  |  |
Cerro Casale |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Reversal of impairment charges |  |  |  |  |  | 97.0 |  |  |  |
Gains on disposals of investments |  |  |  |  |  |  |  |  |  | 12.7
Cerro Casale | Goldcorp Inc. ("Goldcorp") |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Interest disposed (percentage) |  |  |  |  |  |  |  | 25.00% |  |
Contingent payment |  |  |  |  |  | 40.0 |  |  |  |
Quebrada Seca exploration project | Goldcorp Inc. ("Goldcorp") |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Interest disposed (percentage) |  |  |  |  |  |  |  | 100.00% |  |
Gross cash proceeds |  |  |  |  |  | $ 20.0 |  |  |  |
White Gold |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Losses on disposals of investments |  |  |  |  |  |  |  |  |  | 1.7
White Gold | White Gold Corp |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Interest disposed (percentage) |  |  |  |  |  |  | 100.00% |  |  |
DeLamar |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Gains on disposals of investments |  |  |  |  |  |  |  |  |  | $ 44.2
DeLamar | Integra |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Interest disposed (percentage) |  |  | 100.00% |  |  |  |  |  |  |

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