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Capital Management - Summary of Reconciliation of Net Operating Profit (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Times
Dec. 31, 2022
USD ($)
Times
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of financial assets [abstract]        
Borrowings $ 1,236.5 $ 1,079.3    
Add: Lease liability 436.4 394.2    
Less: Cash and cash equivalents 648.7 769.4 $ 524.7 $ 886.8
Net debt 1,024.2 704.1    
Adjusted EBITDA $ 2,428.3 $ 2,440.1    
Net debt to adjusted EBITDA ratio | Times 0.42 0.29    
Adjusted EBITDA to net finance charges ratio | Times 23.6 25.1    
Reconciliation of profit for the year to adjusted EBITDA:        
Profit from continuing operations $ 745.2 $ 708.7 858.9  
Mining and income taxation 465.1 442.1 424.9  
Royalties 116.4 110.4 112.4  
Finance expense 62.9 72.5 100.9  
Investment income (24.9) (13.3) (8.3)  
Gain on financial instruments 0.0 (24.0) 100.4  
Foreign exchange loss/(gain) 5.6 (6.7) 1.9  
Depreciation and amortisation 795.3 844.3 713.2  
Share-based payments 9.1 6.9 12.7  
Long-term incentive plan 55.8 29.0 28.5  
Restructuring costs 7.8 11.3 1.3  
Silicosis settlement costs (4.1) (2.2) (0.7)  
Impairment of investments and assets 156.4 505.0 42.4  
Profit on disposal of assets (32.4) (10.4) (8.5)  
Share of results of equity accounted investees, net of tax 32.6 2.9 2.6  
Yamana break fee 0.0 (300.0) 0.0  
Yamana transaction costs 0.0 33.0 $ 0.0  
Rehabilitation expense/(income) 4.0 (8.9)    
Realised gain on derivative contracts 0.0 22.2    
Ghana expected credit loss 33.2 17.5    
Other 0.3 (0.2)    
Adjusted EBITDA $ 2,428.3 $ 2,440.1