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Capital Management - Summary of Reconciliation of Net Operating Profit (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Times
Dec. 31, 2020
USD ($)
Times
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of financial assets [abstract]        
Borrowings $ 1,078.1 $ 1,526.9    
Add: Lease liability 415.5 429.0    
Less: Cash and cash equivalents 524.7 886.8 $ 515.0 $ 219.7
Net debt 968.9 1,069.1    
Adjusted EBITDA $ 2,393.6 $ 1,910.2    
Net debt to adjusted EBITDA ratio | Times 0.40 0.56    
Reconciliation of profit for the year to adjusted EBITDA:        
Profit for the year $ 829.5 $ 745.4 174.7  
Mining and income taxation 424.9 432.5 175.6  
Royalties 112.4 105.0 73.7  
Finance expense 100.9 126.7 102.2  
Investment income (8.3) (8.7) (7.3)  
Loss on financial instruments 100.4 238.9 238.0  
Foreign exchange loss/(gain) 1.9 (8.6) 5.2  
Depreciation and amortisation 713.2 661.3 610.0  
Share-based payments 12.7 14.5 20.5  
Long-term incentive plan 28.5 51.3 9.1  
Restructuring costs 1.3 2.0 0.6  
Silicosis settlement costs (0.7) 0.3 (1.6)  
Impairment, net of reversal of impairment of investments and assets 42.4 (50.6) 9.8  
(Profit)/loss on disposal of assets (8.5) 0.2 (1.2)  
Share of results of equity accounted investees, net of taxation 32.0 2.6 $ (3.1)  
Rehabilitation expense 10.8 1.5    
Realised loss on derivative contracts (43.4) (416.6)    
Ghana expected credit loss 41.1 29.0    
Salares VAT 0.0 (23.9)    
Other 2.5 7.4    
Adjusted EBITDA $ 2,393.6 $ 1,910.2