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Financial risk management (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financial Risk Management    
Cumulative translation adjustment $ 32.3 $ (68.3)
Borrowings 80.0 210.0
Investments and loan receivable 183.2 169.7
Credit Facility    
Financial Risk Management    
Borrowings   210.0
Foreign Exchange Risk    
Financial Risk Management    
Cumulative translation adjustment $ 32.3 $ (68.3)
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 $ 0.3 $ 0.1
Interest rate sensitivities decrease effect on net income (0.3) (0.1)
Interest rate sensitivities increase effect on equity 0.3 0.1
Interest rate sensitivities decrease effect on equity (0.3) (0.1)
Borrowings 80.0 207.6
Liquidity Risk    
Financial Risk Management    
Cash and cash equivalents and available-for-sale securities $ 132.1 69.7
Term of financial liabilities 1 year  
Capital Risk Management    
Financial Risk Management    
Cash and cash equivalents and available-for-sale securities $ 132.1 69.7
Investments and loan receivable 183.2 169.7
Liquid securities 141.7 132.8
Capital Risk Management | Credit Facility    
Financial Risk Management    
Undrawn borrowing facilities $ 1,100.0 $ 1,100.0