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Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Investments and loan receivable          
Investments $ 232.3   $ 232.3   $ 227.2
Equity method investments 229.7   229.7   224.6
Equity investments          
Investments and loan receivable          
Investments 229.7   229.7   224.6
Cost of equity investments disposed of 1.3 $ 1.1 1.3 $ 1.1  
Gross proceeds from disposal     1.9 1.7  
Unrealized gains losses on available-for-sale investments          
(Loss) gain on changes in the fair value of equity investments at FVTOCI (6.6) (88.4) 1.2 (65.8)  
Income tax recovery (expense) in other comprehensive income 0.8 11.6 (0.2) 8.7  
(Loss) gain on changes in the fair value of equity investments at FVTOCI, net of income tax (5.8) $ (76.8) 1.0 $ (57.1)  
Labrador Iron Ore Royalty Corporation          
Investments and loan receivable          
Equity method investments 148.6   148.6   157.0
Other          
Investments and loan receivable          
Equity method investments 81.1   81.1   67.6
Warrants          
Investments and loan receivable          
Investments $ 2.6   $ 2.6   $ 2.6