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Royalty, stream and working interests - Impairments (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 20, 2021 | Jun. 30, 2021 | Dec. 31, 2013 | Dec. 31, 2020 | Dec. 31, 2019
Royalty, stream and working interests |  |  |  |  |
Carrying value |  | $ 5,222.4 |  | $ 4,632.1 | $ 4,797.8
Streams |  |  |  |  |
Royalty, stream and working interests |  |  |  |  |
Carrying value |  | 2,720.8 |  | 2,653.6 | 2,804.0
Recoverable amount |  | 32.7 |  |  |
Streams | Sudbury (McCreedy West) |  |  |  |  |
Royalty, stream and working interests |  |  |  |  |
Impairments |  |  | $ 107.9 |  |
Impairment reversal amount |  | 0.0 |  |  |
Recoverable amount |  | 32.7 |  |  |
Mining Royalties |  |  |  |  |
Royalty, stream and working interests |  |  |  |  |
Carrying value |  | $ 931.8 |  | $ 406.9 | $ 415.6
Mining Royalties | Agi Dagi |  |  |  |  |
Royalty, stream and working interests |  |  |  |  |
Impairment loss | $ 7.5 |  |  |  |

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