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Investments and loan receivable (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investments and loan receivable    
Investments and loan receivable $ 183.2 $ 169.7
Unrealized gains losses on available-for-sale investments    
Gain (loss) on change in the fair value of equity investments at FVTOCI 11.4 (21.4)
Deferred tax (expense) recovery in other comprehensive income (1.5) 3.0
Gain (loss) on change in the fair value of equity investments at FVTOCI, net of tax 9.9 (18.4)
Equity investments    
Investments and loan receivable    
Investments and loan receivable 145.6 136.7
Loan receivable    
Investments and loan receivable    
Investments and loan receivable 3.0 0.7
Warrants    
Investments and loan receivable    
Investments and loan receivable $ 34.6 $ 32.3