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Investments and loan receivable (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 11, 2020
May 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Investments and loan receivable              
Investments     $ 15.0   $ 15.0    
Investments and loan receivable     179.9   179.9   $ 183.2
Unrealized gains losses on available-for-sale investments              
Gain on change in the fair value of equity investments at FVTOCI     42.6 $ 28.2 1.9 $ 54.5  
Deferred tax expense in other comprehensive income     (5.6) (3.4) (0.2) (6.8)  
Gain on change in the fair value of equity investments at FVTOCI, net of tax     37.0 $ 24.8 1.7 $ 47.7  
Alpala Royalty Northern Ecuador              
Investments and loan receivable              
Loan extended term 8 months 8 months          
Equity investments              
Investments and loan receivable              
Investments and loan receivable     141.1   141.1   145.6
Loan receivable              
Investments and loan receivable              
Investments     15.0   15.0    
Investments and loan receivable     35.9   35.9   34.6
Warrants              
Investments and loan receivable              
Investments and loan receivable     $ 2.9   $ 2.9   $ 3.0