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Investments and loan receivable (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Investments and loan receivable          
Investments and loan receivable (note 5) $ 308.2 $ 238.4 $ 308.2 $ 238.4 $ 238.4
Unrealized gains losses on available-for-sale investments          
Gain on change in the fair value of equity investments at FVTOCI 53.5 42.6 74.9 1.9  
Tax expense in other comprehensive income (6.8) (5.6) (9.6) (0.2)  
Gain on change in the fair value of equity investments at FVTOCI, net of tax 46.7 $ 37.0 65.3 $ 1.7  
Equity investments          
Investments and loan receivable          
Investments and loan receivable (note 5) 266.5   266.5   195.6
Equity method investments 266.5   266.5   195.6
Cost of equity investments disposed of 4.6   4.6    
Gross proceeds from disposal     12.7    
Labrador Iron Ore Royalty Corporation          
Investments and loan receivable          
Equity method investments 239.9   239.9   162.2
Other          
Investments and loan receivable          
Equity method investments 26.6   26.6   33.4
Loan receivable          
Investments and loan receivable          
Investments and loan receivable (note 5) 38.4   $ 38.4   37.1
Loan bears interest     7.00%    
Warrants          
Investments and loan receivable          
Investments and loan receivable (note 5) $ 3.3   $ 3.3   $ 5.7