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Royalty, Stream and Working Interests, Net - Impairments of Royalties, Streams and Working Interests (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impairments |  |  |  |
Impairment |  | $ 0 | $ 67,500,000 |
Carrying value |  | $ 3,939,200,000 | 3,668,300,000 | $ 3,257,500,000
Net smelter royalty interest percent sold (as a percent) | 1.00% |  |  |
Net smelter royalty interest held | 2.50% |  |  |
Net proceeds from sale of smelter royalty interest | $ 30,300,000 |  |  |
Gross proceeds from sale of smelter royalty interest | 36,000,000 |  |  |
Carrying value of smelter royalty interest subject to buyback provision | 16,200,000 |  |  |
Gain on sale of royalty interest | $ 14,100,000 |  | 14,100,000 |
Cooke 4 |  |  |  |
Impairments |  |  |  |
Impairment |  |  | 67,400,000 |
Recoverable amount of cash generating unit |  |  | 2,100,000 |
Long term gold price (in dollars per ounce) |  |  | $ 1,321 |
Discount rate (as a percent) |  |  | 8.00% |
Change in gold price assumption for impairment analysis (as a percent) |  |  | 10.00% |
Change in discount rate assumption for impairment analysis (as a percent) |  |  | 3.00% |
Change in expected cash flow timing for impairment analysis |  |  | 5 years |
Exploration Assets |  |  |  |
Impairments |  |  |  |
Impairment |  |  | $ 100,000 |

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- Definition The percent change in discount rate assumptions applied to cash flow projection in determining impairment. + References No definition available. + Details
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- Definition The change in timing of expected future cash flows assumptions applied to cash flow projection in determining impairment. + References No definition available. + Details
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