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Cost of Sale - Summary of Cost of Sale (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of cost of sales [abstract]      
Salaries and wages $ (352.5) $ (334.8) $ (392.8)
Consumable stores (267.4) (270.4) (280.0)
Utilities (121.3) (131.5) (148.3)
Mine contractors (575.3) (511.0) (365.3)
Other (238.1) (218.8) (204.4)
Cost of sales before gold inventory change and amortisation and depreciation (1,554.6) (1,466.5) (1,390.8)
Gold inventory change 65.5 43.0 16.2
Cost of sales before amortisation and depreciation (1,489.1) (1,423.5) (1,374.6)
Amortisation and depreciation (661.3) (610.0) (668.4)
Total cost of sales $ (2,150.4) $ (2,033.5) $ (2,043.0)