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Royalty, stream and working interests - Mine Waste Solutions stream (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020
Royalty, stream and working interests |  |
Recoverable amount |  | $ 476.7
Streams |  |
Royalty, stream and working interests |  |
Impairment reversal amount | $ (9.6) |
Recoverable amount | 114.8 |
Streams | Mine Waste Solutions |  |
Royalty, stream and working interests |  |
Impairment reversal amount | (9.6) |
Recoverable amount | $ 114.8 |

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