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Financial Risk Management (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financial Risk Management    
Cumulative translation adjustment $ 34,800,000 $ (92,000,000.0)
Investments (Note 6) 254,500,000 227,200,000
Credit Facility    
Financial Risk Management    
Borrowings 0  
Foreign Exchange Risk    
Financial Risk Management    
Cumulative translation adjustment $ (34,800,000) $ 92,000,000.0
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 $ 4,600,000 $ 4,600,000
Interest rate sensitivities decrease effect on net income (4,300,000) (800,000)
Interest rate sensitivities increase effect on equity 4,600,000 4,600,000
Interest rate sensitivities decrease effect on equity (4,300,000) (800,000)
Liquidity Risk    
Financial Risk Management    
Cash and cash equivalents and available-for-sale securities $ 1,421,900,000 1,196,500,000
Term of financial liabilities 1 year  
Capital Risk Management    
Financial Risk Management    
Cash and cash equivalents and available-for-sale securities $ 1,421,900,000 1,196,500,000
Borrowings 24,800,000 0
Investments (Note 6) 254,500,000 227,200,000
Liquid securities 241,800,000 220,800,000
Capital Risk Management | Credit Facility    
Financial Risk Management    
Undrawn borrowing facilities $ 1,000,000,000.0 $ 1,000,000,000.0