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Accounting Policies - Narrative (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
CAD ($)
Disclosure of changes in accounting estimates [line items]        
Property, plant and equipment $ 4,815.7 $ 5,079.1    
Impairment loss recognised in profit or loss, property, plant and equipment 391.4 11.6 $ 11.7  
Gold-in-process and stockpiles 725.7 565.8    
Total equity accounted investees 84.9 178.8    
Provision for decommissioning, restoration and rehabilitation costs 387.7 430.9 381.5  
Current provision for decommissioning, restoration and rehabilitation costs 17.2 12.0    
Non-current provision for decommissioning, restoration and rehabilitation costs 370.5 418.9    
Provisions 10.5 13.1 18.3  
Current portion of silicosis settlement costs 1.3 0.6    
Non-current portion of silicosis settlement costs 9.2 12.5    
Deferred taxation liabilities 399.8 500.9    
Deferred taxation asset 195.5 260.6    
Tax receivable, net (22.4) 115.9 121.3  
Tax receivable 76.0 0.0   $ 100.3
Tax payable 53.6 (115.9)    
Share-based payments 6.9 12.7 14.5  
Charge to income statement 29.0 28.5 51.3  
Long term incentive plan liability 53.0 56.6 67.2  
Current portion of long-term incentive plan 30.6 28.4    
Non-current portion of long-term incentive plan 22.4 28.2    
Derivative financial liabilities 0.0 6.8    
(Gain)/loss on financial instruments (24.0) 96.4 240.2  
Asanko redeemable preference shares $ 60.3 94.5    
Dividends withholding tax percentage 20.00%      
Tarkwa cash-generating unit        
Disclosure of changes in accounting estimates [line items]        
Impairment loss recognised in profit or loss, property, plant and equipment $ 325.2 0.0 0.0  
Peru cash-generating unit        
Disclosure of changes in accounting estimates [line items]        
Impairment loss recognised in profit or loss, property, plant and equipment $ 63.1 $ 0.0 $ 0.0  
Rand        
Disclosure of changes in accounting estimates [line items]        
Closing exchange rate 17.02 15.94 14.69 17.02
Average exchange rate 16.37 14.79 16.38  
US Dollar        
Disclosure of changes in accounting estimates [line items]        
Closing exchange rate 0.69 0.73 0.77 0.69
Average exchange rate 0.68 0.75 0.69  
Trade and other payables        
Disclosure of changes in accounting estimates [line items]        
Derivative financial liabilities $ 0.0 $ 6.8    
Trade and other receivables        
Disclosure of changes in accounting estimates [line items]        
Derivative financial assets $ 0.0 $ 5.1