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Capital Management - Summary of Reconciliation of Net Operating Profit (Detail)
$ in Millions
 12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2019
USD ($)
Times
Dec. 31, 2018
USD ($)
Times
Dec. 31, 2017
USD ($)
Times
Jan. 01, 2019
USD ($)
Dec. 31, 2016
USD ($)
 [1]
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Borrowings   $ 1,845.8 $ 1,906.8 [1] $ 1,782.4 [1]    
Less: Cash and cash equivalents $ 393.8 515.0 219.7 [1] 393.8 [1]   $ 471.0
Net debt 1,388.6   $ 1,687.1 $ 1,388.6    
Lease liability         $ 209.6  
Net debt to adjusted EBITDA | Times     1.52 1.10    
Reconciliation of (loss)/profit for the year to adjusted EBITDA:            
Profit/(loss) for the year   174.7 $ (344.8) $ (7.7)    
Mining and income taxation   175.6 (65.9) [1] 173.2 [1]    
Royalties [1]   73.7 62.5 62.0    
Finance expense   102.2 88.0 81.3    
Investment income   (7.3) (7.8) (5.6)    
Gain on financial instruments   238.0 (21.0) (34.4)    
Foreign exchange loss   5.2 (6.4) 3.5    
Amortisation and depreciation   610.0 668.4 748.1    
Share-based payments   20.5 37.5 26.8    
Long-term incentive plan   9.1 1.1 [1] 5.0 [1]    
Restructuring costs   0.6 113.9 9.2    
Silicosis settlement costs   (1.6) (4.5) [1] 30.2 [1]    
Impairment, net of reversal of impairment of investments and assets   9.8 520.3 200.2    
Profit on disposal of assets   (1.2) 51.6 (4.0)    
Share of results of equity accounted investees, net of taxation   (3.1) 13.1 1.3    
Rehabilitation income   13.4 (0.9)      
Realised gain on derivative contracts   (132.1) 53.8      
Gain on acquisition of Asanko   0.0 (51.8) [1] 0.0 [1]    
Lease payments   (56.9) 0.0      
Other   2.7 4.5      
Adjusted EBITDA $ 1,263.7 1,233.3 1,111.6 $ 1,263.7    
Increase (decrease) due to changes in accounting policy required by IFRSs [member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Lease liability   332.9        
Reconciliation of (loss)/profit for the year to adjusted EBITDA:            
Lease payments   56.9        
Pre IFRS16 [member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Net debt   $ 1,330.8 $ 1,687.1      
Net debt to adjusted EBITDA | Times   1.08 1.52      
Reconciliation of (loss)/profit for the year to adjusted EBITDA:            
Adjusted EBITDA   $ 1,233.3 $ 1,111.6      
IFRS16 [member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Net debt   $ 1,663.7        
Net debt to adjusted EBITDA | Times   1.29        
Reconciliation of (loss)/profit for the year to adjusted EBITDA:            
Adjusted EBITDA   $ 1,290.2        
[1] Refer note 42.