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Investments (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 12, 2024
USD ($)
$ / shares
Jul. 12, 2024
$ / shares
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Investments              
Investments     $ 278.0   $ 278.0   $ 254.5
Equity method investments     267.5   267.5   246.4
G Mining Ventures Corp, Tocantinzinho Project, Brazil | Major Acquisitions              
Investments              
Price per share | $ / shares   $ 2.279          
Share subscription $ 25.0            
Equity investments              
Investments              
Investments     267.5   267.5   246.4
Cost of equity investments disposed of         12.3 $ 1.3  
Gross proceeds from disposal         8.5 1.9  
Unrealized gains (loss) on available-for-sale investments              
Gain (loss) on changes in the fair value of equity investments at FVTOCI     17.8 $ (6.6) 19.8 1.2  
Income tax (expense) recovery in other comprehensive income (loss)     (2.4) 0.8 (2.6) (0.2)  
Gain (loss) on changes in the fair value of equity investments at FVTOCI, net of income tax     15.4 $ (5.8) 17.2 $ 1.0  
Labrador Iron Ore Royalty Corporation              
Investments              
Equity method investments     134.6   134.6   152.7
G Mining Ventures              
Investments              
Equity method investments     77.1   77.1   47.6
G Mining Ventures | G Mining Ventures Corp, Tocantinzinho Project, Brazil              
Investments              
Price per share | $ / shares $ 2.279            
Share subscription $ 25.0            
Other              
Investments              
Equity method investments     55.8   55.8   46.1
Warrants              
Investments              
Investments     $ 10.5   $ 10.5   $ 8.1