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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Other operating activities    
Unrealized foreign exchange losses $ 5.6 $ 12.9
Gains on derivatives (Note 10(d)) (8.3) (7.3)
Share-based compensation expense (Note 23) 5.5 3.9
(Gains) losses on disposition of mineral properties, plant and equipment (7.9) 2.4
Adjustments for non-cash statement of earnings items (5.1) 11.9
Changes in non-cash operating working capital items:    
Trade and other receivables 45.9 (12.6)
Inventories 38.5 (49.9)
Prepaid expenses 9.4 2.5
Accounts payable and accrued liabilities (10.0) 20.7
Provisions (14.9) (2.7)
Changes in non-cash working capital 68.9 (42.0)
Cash and Cash Equivalents    
Cash in banks $ 399.6 $ 107.0