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Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Investments and loan receivable    
Investments $ 254.5 $ 227.2
Equity method investments 246.4 224.6
Unrealized gains losses on available-for-sale investments    
Gain (loss) on changes in the fair value of equity investments at FVTOCI 8.4 (42.3)
Income tax (expense) recovery in other comprehensive income (loss) 1.1 (5.6)
Gain (loss) on changes in the fair value of equity investments at FVTOCI 7.3 (36.7)
Equity investments    
Investments and loan receivable    
Investments 246.4 224.6
Cost of equity investments disposed of 1.5 1.1
Gross proceeds from disposal 2.0 1.8
Unrealized gains losses on available-for-sale investments    
Gain (loss) on changes in the fair value of equity investments at FVTOCI 8.4 (42.3)
Income tax (expense) recovery in other comprehensive income (loss) (1.1) 5.6
Gain (loss) on changes in the fair value of equity investments at FVTOCI 7.3 (36.7)
Labrador Iron Ore Royalty Corporation    
Investments and loan receivable    
Equity method investments 152.7 157.0
G Mining Ventures    
Investments and loan receivable    
Equity method investments 47.6 22.8
Other    
Investments and loan receivable    
Equity method investments 46.1 44.8
Warrants    
Investments and loan receivable    
Investments $ 8.1 $ 2.6