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Investments (Tables) | 6 Months Ended
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Jun. 30, 2025
Investments |
Schedule of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | At June 30, | ​ | ​ | At December 31, |
​ |  |  | 2025 |  |  | 2024 |
Equity investments at FVTOCI | ​ | ​ | $ | 590.4 | ​ | ​ | $ | 324.8 | ​
Warrants | ​ | ​ |  | 7.4 | ​ | ​ |  | 0.7 | ​
​ | ​ | ​ | $ | 597.8 | ​ | ​ | $ | 325.5 | ​
Schedule of equity method investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | At June 30, | ​ | ​ | At December 31, |
​ |  |  | 2025 |  |  | 2024 |
G Mining Ventures Corp. | ​ | ​ | $ | 232.3 | ​ | ​ | $ | 133.8 | ​
Discovery Silver Corp. | ​ | ​ | ​ | 172.2 | ​ | ​ | ​ | — | ​
Labrador Iron Ore Royalty Corporation ("LIORC") | ​ | ​ | ​ | 131.7 | ​ | ​ | ​ | 127.3 | ​
Other | ​ | ​ |  | 54.2 | ​ | ​ |  | 63.7 | ​
​ | ​ | ​ | $ | 590.4 | ​ | ​ | $ | 324.8 | ​
Schedule of unrealized gains (losses) on available-for-sale investments recognized in other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | For the six months ended |
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2025 |  | 2024 |  |  | 2025 |  |  | 2024 |
Net gain on changes in the fair value of equity investments at FVTOCI | ​ | $ | 35.9 | ​ | $ | 17.8 | ​ | ​ | $ | 207.4 | ​ | ​ | $ | 19.8 | ​
Income tax expense in other comprehensive (loss) income | ​ |  | (4.7) | ​ |  | (2.4) | ​ |  | ​ | (27.4) | ​ | ​ |  | (2.6) | ​
Gain on changes in the fair value of equity investments at FVTOCI, net of income tax | ​ | $ | 31.2 | ​ | $ | 15.4 | ​ |  | $ | 180.0 | ​ | ​ | $ | 17.2 | ​
​

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