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Investments and loan receivable (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 04, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Investments and loan receivable            
Investments (Note 5)   $ 213.2   $ 213.2   $ 235.9
Equity method investments   210.6   210.6   235.1
Unrealized gains losses on available-for-sale investments            
Loan receivable           39.7
Repayment of loan $ 42.7          
Equity investments            
Investments and loan receivable            
Investments (Note 5)   210.6   210.6   235.1
Cost of equity investments disposed of   1.1 $ 4.6 1.1 $ 4.6  
Gross proceeds from disposal       1.7 12.7  
Unrealized gains losses on available-for-sale investments            
(Loss) gain on changes in the fair value of equity investments at FVTOCI   (88.4) 53.5 (65.8) 74.9  
Income tax recovery (expense) in other comprehensive income   11.6 (6.8) 8.7 (9.6)  
(Loss) gain on changes in the fair value of equity investments at FVTOCI, net of income tax   (76.8) $ 46.7 (57.1) $ 65.3  
Labrador Iron Ore Royalty Corporation            
Investments and loan receivable            
Equity method investments   139.3   139.3   187.4
SLM California            
Investments and loan receivable            
Equity method investments   37.4   37.4    
Other Equity Investments            
Investments and loan receivable            
Equity method investments   33.9   33.9   47.7
Warrants.            
Investments and loan receivable            
Investments (Note 5)   $ 2.6   $ 2.6   $ 0.8