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Capital Management - Summary of Reconciliation of Net Operating Profit (Detail)
number in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Times
Dec. 31, 2021
USD ($)
Times
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of financial assets [abstract]        
Borrowings $ 1,079.3 $ 1,078.1    
Add: Lease liability 394.2 415.5    
Less: Cash and cash equivalents 769.4 524.7 $ 886.8 $ 515.0
Net debt 704.1 968.9    
Adjusted EBITDA $ 2,440.1 $ 2,393.6    
Net debt to adjusted EBITDA ratio | Times 0.29 0.40    
Adjusted EBITDA to net finance charges ratio 25.1 22.8    
Reconciliation of profit for the year to adjusted EBITDA:        
Profit for the year $ 721.7 $ 829.5 745.4  
Mining and income taxation 442.1 424.9 432.5  
Royalties 110.4 112.4 105.0  
Finance expense 72.5 100.9 126.7  
Investment income (13.3) (8.3) (8.7)  
(Gain)/loss on financial instruments (24.0) 100.4 238.9  
Foreign exchange (gain)/loss (6.7) 1.9 (8.6)  
Depreciation and amortisation 844.3 713.2 661.3  
Share-based payments 6.9 12.7 14.5  
Long-term incentive plan 29.0 28.5 51.3  
Restructuring costs 11.3 1.3 2.0  
Silicosis settlement costs (2.2) (0.7) 0.3  
Impairment, net of reversal of impairment of investments and assets 505.0 42.4 (50.6)  
Profit on disposal of assets (10.4) (8.5) 0.2  
Share of results of equity accounted investees, net of taxation (10.1) 32.0 2.6  
Yamana break fee (300.0) 0.0 0.0  
Yamana transaction costs 33.0 0.0 0.0  
Rehabilitation expense (8.9) 10.8    
Realised gain/(loss) on derivative contracts 22.2 (43.4)    
Ghana expected credit loss 17.5 41.1 $ 29.0  
Other (0.2) 2.5    
Adjusted EBITDA $ 2,440.1 $ 2,393.6