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Acquisitions and other transactions (Details) $ in Millions |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |
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Oct. 01, 2020 USD ($) | Sep. 23, 2020 USD ($) | Sep. 11, 2020 USD ($) | Sep. 01, 2020 USD ($) item oz | Mar. 20, 2020 CAD ($) | Dec. 23, 2019 CAD ($) | Nov. 22, 2019 CAD ($) a | Sep. 25, 2019 USD ($) item | Jul. 22, 2019 USD ($) a | Feb. 21, 2019 USD ($) | Jan. 31, 2019 USD ($) EquityInstruments | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 29, 2020 USD ($) | Mar. 20, 2020 USD ($) | Mar. 04, 2020 | Dec. 23, 2019 USD ($) | Feb. 21, 2019 CAD ($) | Feb. 21, 2019 USD ($)
U.S. Oil & Gas Royalty Interest - Haynesville, Texas, USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 135.0 |  |  |  |  |
Value of royalties generated by the acquired assets | $ 4.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment of Sabodala Gold Stream Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of the project by Teranga |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |
Amendment of Sabodala Gold Stream Agreement Fixed Stream [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deliveries of ounces of refined gold per month untill threshold | oz |  |  |  | 783.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deliveries of ounces of refined gold threshold | oz |  |  |  | 105,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refined gold delivery as percentage of production from stream area |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment of Sabodala Gold Stream Agreement Variable Stream [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deliveries of ounces of refined gold threshold | oz |  |  |  | 105,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refined gold delivery as percentage of production from stream area |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rio Baker (Salares Nortes) Royalty , Chile [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NSR |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration recognised as of acquisition date |  | $ 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash transferred |  | $ 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exposure to deposits |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to buy back of NSR (as a percent) |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of option to buy back of NSR |  | $ 4.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salares Norte Royalty Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  | $ 32.0 |  |  |  |  |  |  |  |
Percentage of NSR |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Cash transferred |  |  |  |  |  |  |  |  |  |  | $ 5.0 |  |  |  |  |  |  |  |
Option to buy back of NSR (as a percent) |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Value of option to buy back of NSR |  |  |  |  |  |  |  |  |  |  | $ 6.0 |  |  |  |  |  |  |  |
Period to buy back of NSR |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |  |  |  |
Salares Norte Royalty Interest | Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common shares issued in acquisition |  |  |  |  |  |  |  |  |  |  | $ 27.0 |  |  |  |  |  |  |  |
Number of instruments or interests issued or issuable | EquityInstruments |  |  |  |  |  |  |  |  |  |  | 366,499 |  |  |  |  |  |  |  |
Valentine Lake Royalty Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000,000 | $ 13.7
Percentage of NSR |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |
Option to buy back of NSR (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.50%
Value of option to buy back of NSR |  |  |  |  |  |  |  |  |  | $ 7.0 |  |  |  |  |  |  |  |  |
Eagle's Nest Royalty Interest - Ontario, Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  | $ 3.8 |  |
Acquired gross royalty percent |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Project 81 Royalty Interest And Noble Common Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NSR |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of royalties acquired | a |  |  |  |  |  |  | 55,000 |  |  |  |  |  |  |  |  |  |  |  |
Premier Gold Royalty Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  | $ 6.0 |  |  |  |  |  |  |  |  |  |  |
Number of royalties acquired | item |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Premier Gold Royalty Interests | Newmont Goldcorp Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NSR |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Premier Gold Royalty Interests | Nevada Gold Mines L L C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NSR |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
US Oil Gas Royalties Interests Marcellus, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  | $ 300.0 |  |  |  |  |  |  |  |  |  |
Value of royalties generated by the acquired assets |  |  |  |  |  |  |  |  | $ 9.4 |  |  |  |  |  |  |  |  |  |
Percentage of gross production |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Number of acres allowed as deduction | a |  |  |  |  |  |  |  |  | 350,000 |  |  |  |  |  |  |  |  |  |
Alpala Royalty Northern Ecuador |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 100.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NSR |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to buy back of NSR (as a percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of the project by SolGold PLC |  |  | 85 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of the project by Cornerstone Capital Resource Inc. |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of funding that can be increased |  |  | $ 150.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased Percentage of NSR |  |  | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan extended |  |  | $ 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Island Gold Royalty Ontario, Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 19,000,000 |  |  |  |  |  |  |  |  |  | $ 13.4 |  |  |  |
Percentage of NSR |  |  |  |  | 0.62% |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Central Oklahoma Oil Province And Sooner Trend Anadarko Basin Canadian And Kingfisher Countries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total contributions made |  |  |  |  |  |  |  |  |  |  |  | $ 29.8 | $ 114.4 |  |  |  |  |  |
Cumulative investment in royalty acquisition venture |  |  |  |  |  |  |  |  |  |  |  | 406.0 |  |  |  |  |  |  |
South Central Oklahoma Oil Province And Sooner Trend Anadarko Basin Canadian And Kingfisher Countries | Top |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cumulative investment |  |  |  |  |  |  |  |  |  |  |  | 114.0 |  |  |  |  |  |  |
South Central Oklahoma Oil Province And Sooner Trend Anadarko Basin Canadian And Kingfisher Countries | Accounts payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  |  | $ 10.2 | $ 5.6 |  |  |  |  |  |
Freeport Royalty Portfolio Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash transferred |  |  |  | $ 30.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Royalty Portfolio Acquired | item |  |  |  | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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