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Financial risk management (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial Risk Management      
Cumulative translation adjustment $ (4.0) $ 19.6  
Borrowings     $ 80.0
Investments and loan receivable (note 6) $ 235.9 $ 238.4  
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 $ 2.0 $ 1.8  
Interest rate sensitivities decrease effect on net income (0.4) (0.5)  
Interest rate sensitivities increase effect on equity 2.0 1.8  
Interest rate sensitivities decrease effect on equity (0.4) (0.5)  
Liquidity Risk      
Financial Risk Management      
Cash and cash equivalents and available-for-sale securities $ 539.3 534.2  
Term of financial liabilities 1 year    
Capital Risk Management      
Financial Risk Management      
Cash and cash equivalents and available-for-sale securities $ 539.3 534.2  
Borrowings 39.7 37.1  
Investments and loan receivable (note 6) 235.9 201.3  
Liquid securities 231.0 191.8  
Capital Risk Management | Credit Facility      
Financial Risk Management      
Undrawn borrowing facilities $ 1,100.0 $ 1,100.0