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Capital Management - Summary of Reconciliation of Net Operating Profit (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Times
Dec. 31, 2019
USD ($)
Times
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Total borrowings $ 1,526.9 $ 1,845.8    
Add: Lease liability 429.0 332.9    
Less: Cash and cash equivalents 886.8 515.0 $ 219.7 $ 393.8
Net debt 1,069.1 1,663.7    
Adjusted EBITDA $ 1,910.2 $ 1,290.2    
Net debt to adjusted EBITDA ratio | Times 0.56 1.29    
Reconciliation of profit for the year to adjusted EBITDA:        
Profit/(loss) for the year $ 745.4 $ 174.7 (344.8)  
Mining and income taxation 432.5 175.6 (65.9)  
Royalties 105.0 73.7 62.5  
Finance expense 126.7 102.2 88.0  
Investment income (8.7) (7.3) (7.8)  
Loss on financial instruments 238.9 238.0 (21.0)  
Foreign exchange (gain)/loss (8.6) 5.2 (6.4)  
Amortisation and depreciation 661.3 610.0 668.4  
Share-based payments 14.5 20.5 37.5  
Long-term incentive plan 51.3 9.1 1.1  
Restructuring costs [1] 2.0 0.6 113.9  
Silicosis settlement costs 0.3 (1.6) (4.5)  
Impairment, net of reversal of impairment of investments and assets (50.6) 9.8 520.3  
Loss/(profit) on disposal of assets 0.2 (1.2) 51.6  
Share of results of equity accounted investees, net of taxation 2.6 (3.1) $ 13.1  
Rehabilitation expense 1.5 13.4    
Realised loss on derivative contracts (416.6) (132.1)    
Tarkwa expected credit loss 29.0 0.0    
Salares VAT (23.9) 0.0    
Other 7.4 2.7    
Adjusted EBITDA $ 1,910.2 $ 1,290.2    
[1] The restructuring costs in 2020 comprise mainly separation packages at Tarkwa amounting to US$1.2 million (2019: US$0.3 million and 2018: US$88.8 million), St Ives of US$0.8 million (2019: US$nil and 2018: US$nil), South Deep amounting to US$nil (2019: US$0.3 million and 2018: US$11.2 million) and Damang amounting to US$nil (2019: US$nil and 2018: US$13.9 million). The restructuring costs of US$88.8 million at Tarkwa in 2018 related to the transition to contractor mining.