Investments and loan receivable (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Investments and loan receivable
Investments and loan receivable (note 6)	$ 235.9	$ 238.4
Equity method investments	$ 235.1	195.6
Loan bears interest	7.00%
Unrealized gains losses on available-for-sale investments
Gain on change in the fair value of equity investments at FVTOCI	$ 26.1	50.5
Tax expense in other comprehensive income	3.5	1.5
Gain (loss) on change in the fair value equity investments at FVTOCI	22.6	43.8
Loan receivable	$ 39.7
Loan Repayment, Percentage of Principal and Interest	105.00%
Equity investments
Investments and loan receivable
Investments and loan receivable (note 6)	$ 235.1	195.6
Cost of equity investments disposed of	4.6
Gross proceeds from disposal	12.7
Unrealized gains losses on available-for-sale investments
Gain on change in the fair value of equity investments at FVTOCI	26.0	50.5
Tax expense in other comprehensive income	3.4	6.7
Gain (loss) on change in the fair value equity investments at FVTOCI	22.6	43.8
Labrador Iron Ore Royalty Corporation
Investments and loan receivable
Equity method investments	187.4	162.2
Other Equity Investments
Investments and loan receivable
Equity method investments	47.7	33.4
Loan receivable
Investments and loan receivable
Investments and loan receivable (note 6)		37.1
Unrealized gains losses on available-for-sale investments
Loan receivable	39.7
Warrants.
Investments and loan receivable
Investments and loan receivable (note 6)	$ 0.8	$ 5.7

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Interest rate of interest on investment.

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The amount of current investments.

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The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

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The amount of other comprehensive income, before tax, after reclassification adjustments, related to available-for-sale financial assets. [Refer: Financial assets available-for-sale; Other comprehensive income, before tax]

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The cash inflow from sales of investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

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