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Investments and loan receivable (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Investments and loan receivable |  |
Investments and loan receivable (note 6) | $ 238.4 | $ 183.2
Unrealized gains losses on available-for-sale investments |  |
Gain on change in the fair value of equity investments at FVTOCI | 50.5 | 11.4
Tax expense in other comprehensive income | (6.7) | (1.5)
Gain on change in the fair value of equity investments at FVTOCI, net of tax | 43.8 | 9.9
Equity investments |  |
Investments and loan receivable |  |
Investments and loan receivable (note 6) | 195.6 | 145.6
Loan receivable |  |
Investments and loan receivable |  |
Investments and loan receivable (note 6) | $ 37.1 | 34.6
Unrealized gains losses on available-for-sale investments |  |
Loan bears interest | 7.00% |
Warrants |  |
Investments and loan receivable |  |
Investments and loan receivable (note 6) | $ 5.7 | $ 3.0

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