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Financial Risk Management (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Financial Risk Management    
Cumulative translation adjustment $ (131.3) $ 34.8
Investments (Note 6) 325.5 254.5
Foreign Exchange Risk    
Financial Risk Management    
Cumulative translation adjustment $ (131.3) $ 34.8
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 $ 6.2 $ 4.6
Interest rate sensitivities decrease effect on net income (5.5) (4.3)
Interest rate sensitivities increase effect on equity 6.2 4.6
Interest rate sensitivities decrease effect on equity (5.5) (4.3)
Liquidity Risk    
Financial Risk Management    
Cash and cash equivalents and available-for-sale securities $ 1,451.3 1,421.9
Term of financial liabilities 1 year  
Capital Risk Management    
Financial Risk Management    
Cash and cash equivalents and available-for-sale securities $ 1,451.3 1,421.9
Investments (Note 6) 325.5 254.5
Liquid securities 316.8 241.8
Capital Risk Management | Labrador Iron Ore Royalty Corporation    
Financial Risk Management    
Liquid securities 127.3 152.7
Capital Risk Management | Credit Facility    
Financial Risk Management    
Undrawn borrowing facilities $ 1,000.0 $ 1,000.0