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Financial risk management (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial Risk Management      
Cumulative translation adjustment $ 19.6 $ 32.3  
Borrowings   80.0 $ 210.0
Investments and loan receivable (note 6) 238.4 183.2  
Credit Facility      
Financial Risk Management      
Borrowings     $ 210.0
Foreign Exchange Risk      
Financial Risk Management      
Cumulative translation adjustment $ 19.6 $ (32.3)  
Interest Rate Risk      
Financial Risk Management      
Increase in interest rate used for sensitivity analysis (as a percent) 0.50% 0.50%  
Decrease in interest rate used for sensitivity analysis (as a percent) 0.50% 0.50%  
Interest rate sensitivities increase effect on net income $ 1.8 $ 0.3  
Interest rate sensitivities decrease effect on net income (0.5) (0.3)  
Interest rate sensitivities increase effect on equity 1.8 0.3  
Interest rate sensitivities decrease effect on equity (0.5) (0.3)  
Borrowings 80.0    
Liquidity Risk      
Financial Risk Management      
Cash and cash equivalents and available-for-sale securities $ 534.2 132.1  
Term of financial liabilities 1 year    
Capital Risk Management      
Financial Risk Management      
Cash and cash equivalents and available-for-sale securities $ 534.2 132.1  
Investments and loan receivable (note 6) 238.4 183.2  
Liquid securities 191.8 141.7  
Capital Risk Management | Credit Facility      
Financial Risk Management      
Undrawn borrowing facilities $ 1,100.0 $ 1,100.0