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Equity-Accounted Investees - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Disclosure of equity-accounted investees [line items]
Investments	$ 113.6	$ 30.8	$ (62.3)
Total equity accounted investees	84.9	178.8		$ 84.9
Far Southeast Gold Resources Incorporated ("FSE")
Disclosure of equity-accounted investees [line items]
Investments	$ 113.6	$ 30.8	$ (62.3)
Asanko Gold Ghana Limited
Disclosure of equity-accounted investees [line items]
Interest in joint venture				45.00%
Government ownership percentage				10.00%
Shika Group Finance Limited
Disclosure of equity-accounted investees [line items]
Interest in joint venture				50.00%
Adansi Gold Company Ghana Limited
Disclosure of equity-accounted investees [line items]
Interest in joint venture				50.00%
Far Southeast Gold Resources Incorporated ("FSE")
Disclosure of equity-accounted investees [line items]
Interest in joint venture	40.00%	40.00%	40.00%
Remaining percentage of ownership not yet exercised	20.00%
Total equity accounted investees	$ 0.0			$ 0.0
Lepanto Consolidated Mining Company
Disclosure of equity-accounted investees [line items]
Interest in joint venture	60.00%
Lepanto Consolidated Mining Company | Far Southeast Gold Resources Incorporated ("FSE")
Disclosure of equity-accounted investees [line items]
Interest in joint venture		60.00%

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Line items represent concepts included in Equity-Accounted Investees table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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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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