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ACQUISITIONS AND DISPOSITIONS - Peak (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Acquisitions and Dispositions |  |  |
Cash consideration |  | $ 267.0 | $ 30.0
Transaction costs |  | $ 4.4 |
Peak Gold, LLC |  |  |
Acquisitions and Dispositions |  |  |
Ownership interest (as a percentage) | 70.00% |  |
Ownership interest in subsidiary (as a percentage) |  | 70.00% |
Cash consideration | $ 93.7 |  |
Transaction costs | 3.2 |  |
Purchase price allocation |  |  |
Property, plant and equipment (including mineral interests) | 136.7 |  |
Other assets - net | 1.2 |  |
Non-controlling interest | (41.0) |  |
Total net assets acquired | $ 96.9 |  |
Proportion of ownership interests held by non-controlling interests | 30.00% |  |
Peak Gold, LLC | Pre-development properties |  |  |
Purchase price allocation |  |  |
Property, plant and equipment (including mineral interests) | $ 136.5 |  |
Peak Gold, LLC | Land, plant and equipment |  |  |
Purchase price allocation |  |  |
Property, plant and equipment (including mineral interests) | $ 0.2 |  |
Peak Gold, LLC | Royal Gold |  |  |
Acquisitions and Dispositions |  |  |
Ownership interest (as a percentage) | 40.00% |  |
Ownership interest in subsidiary (as a percentage) | 40.00% |  |
Cash consideration | $ 49.2 |  |
Peak Gold, LLC | Contango |  |  |
Acquisitions and Dispositions |  |  |
Ownership interest (as a percentage) | 30.00% |  |
Ownership interest in subsidiary (as a percentage) | 60.00% |  |
Cash consideration | $ 44.5 |  |
Purchase price allocation |  |  |
Other assets - net | $ 1.2 |  |

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