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Investments and loan receivable (Details) - USD ($)
$ in Millions
12 Months Ended
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