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Royalty, stream and working interests - Impairment reversal of Mine Waste Solutions stream (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2014 | Dec. 31, 2019 | Dec. 31, 2018
Royalty, stream and working interests |  |  |  |
Carrying value | $ 4,632.1 |  | $ 4,797.8 | $ 4,555.6
Streams |  |  |  |
Royalty, stream and working interests |  |  |  |
Carrying value | 2,653.6 |  | $ 2,804.0 | $ 2,967.6
Streams | Mine Waste Solutions |  |  |  |
Royalty, stream and working interests |  |  |  |
Impairments |  | $ 26.6 |  |
Reversal of impairment loss recognized | 9.6 |  |  |
Carrying value | $ 77.2 |  |  |

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