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Cost of Sale - Summary of Cost of Sale (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Analysis of income and expense [abstract]      
Salaries and wages $ (399.7) $ (397.4) $ (397.8)
Consumable stores (400.8) (397.4) (319.6)
Utilities (150.0) (141.5) (134.1)
Mine contractors (715.9) (658.0) (628.2)
Other (376.0) (337.2) (304.8)
Cost of sales before gold inventory change and amortisation and depreciation (2,042.4) (1,931.5) (1,784.5)
Gold inventory change 90.7 168.1 122.8
Cost of sales before amortisation and depreciation (1,951.7) (1,763.4) (1,661.7)
Amortisation and depreciation (795.3) (844.3) (713.2)
Total cost of sales (2,747.0) (2,607.7) (2,374.9)
Inventory write-down $ 33.8 $ 0.0 $ 0.0