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Financial Risk Management (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financial Risk Management    
Cumulative translation adjustment $ (68.3) $ 77.2
Borrowings 207.6  
Investments 169.7 203.1
Credit Facility    
Financial Risk Management    
Borrowings $ 210.0 0.0
Foreign Exchange Risk    
Financial Risk Management    
Percentage of Interest-bearing deposits in US dollars 69.00%  
Percentage of Interest-bearing deposits in Canadian dollars 13.00%  
Percentage of Interest-bearing deposits in other currencies 18.00%  
Cumulative translation adjustment $ (68.3) $ 77.2
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 $ 0.1 $ 2.2
Interest rate sensitivities decrease effect on net income (0.1) (2.2)
Interest rate sensitivities increase effect on equity 0.1 2.2
Interest rate sensitivities decrease in effect on equity (0.1) (2.2)
Borrowings 207.6 0.0
Liquidity Risk    
Financial Risk Management    
Cash and cash equivalents and available-for-sale securities $ 69.7 511.1
Term of financial liabilities 1 year  
Capital Risk Management    
Financial Risk Management    
Cash and cash equivalents and available-for-sale securities $ 69.7 511.1
Investments 169.7 203.1
Liquid securities 132.8 168.1
Capital Risk Management | Credit Facility    
Financial Risk Management    
Undrawn borrowing facilities $ 890.0 $ 1,100.0