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Trade and other payables (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]
Trade payables	$ 36.9	$ 61.5
Interest payable	14.1	14.1
Accruals	74.9	73.1
Current portion of obligation	42.6	75.7
Current portion of reclamation and closure cost obligations	1.6	0.8
Current portion of derivative liabilities	5.3	1.1
Current portion of lease liabilities	0.7	2.6
Total trade and other payables	196.1	229.0
New Afton free cash flow interest other liabilities
Disclosure of detailed information about financial instruments [line items]
Current portion of obligation	20.0	0.0
New Afton free cash flow interest obligation
Disclosure of detailed information about financial instruments [line items]
Current portion of obligation	0.0	42.7
Rainy River gold stream obligation
Disclosure of detailed information about financial instruments [line items]
Current portion of obligation	$ 42.6	$ 33.1

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- Definition

The amount of liabilities to pay for goods or services that have been received or supplied but have not been paid, invoiced or formally agreed with the supplier, including amounts due to employees.

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The amount of current interest payable. [Refer: Interest payable]

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- Definition

The amount of current lease liabilities. [Refer: Lease liabilities]

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- Definition

The amount of current financial liabilities that the entity does not separately disclose in the same statement or note. [Refer: Other financial liabilities; Current financial liabilities]

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The amount of current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs]

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The amount of current trade payables and current other payables. [Refer: Current trade payables; Other current payables]

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