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Borrowings - Schedule of Borrowings (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
 [1]
Jan. 01, 2018
Dec. 31, 2017
 [1]
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 1,845.8 $ 1,906.8   $ 1,782.4  
Current borrowings (684.9) (92.5) $ (194.5) (194.5)  
Non-current borrowings 1,160.9 1,814.3 $ 1,587.9 1,587.9  
US $1 Billion Notes [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 601.4 849.4   847.9 $ 846.4 [1]
Name of borrower Orogen        
Maturity date 7 October 2020        
US $1 Billion Notes [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate 4.875        
US$500 million 5-year notes issue (the 5-year notes) [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 496.3 0.0   0.0  
Name of borrower Orogen        
Maturity date 15 May 2024        
US$500 million 5-year notes issue (the 5-year notes) [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate 5.125        
US$500 million 10-year notes issue (the 10-year notes) [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 496.1 0.0   0.0  
Name of borrower Orogen        
Maturity date 15 May 2029        
US$500 million 10-year notes issue (the 10-year notes) [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate 6.125        
US$150 million revolving senior secured credit facility - old [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 0.0   0.0 82.0 [1]
Name of borrower La Cima        
Nominal interest rate LIBOR plus 1.63        
Commitment fee 0.65%        
Maturity date 19 September 2017        
US$150 million revolving senior secured credit facility - New [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 83.5 83.5   83.5 0.0 [1]
Name of borrower La Cima        
Commitment fee 0.50%        
Maturity date 19 September 2020        
US$150 million revolving senior secured credit facility - New [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate LIBOR plus 1.20        
US$70 million revolving credit facility [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 0.0   0.0 45.0 [1]
Name of borrower Ghana        
Nominal interest rate LIBOR plus 2.450        
Commitment fee 1.00%        
Maturity date 6 May 2017        
US$100 million revolving senior secured credit facility [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 45.0   45.0 0.0 [1]
Name of borrower Ghana        
Commitment fee 1.40%        
Maturity date 30 November 2021        
US$100 million revolving senior secured credit facility [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate LIBOR plus 3.50        
A$500 million syndicated revolving credit facility [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 168.5 316.5   231.5  
Name of borrower Gruyere        
Commitment fee 0.87%        
Maturity date 24 May 2021        
A$500 million syndicated revolving credit facility [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate BBSY plus 2.175        
US$1,290 million term loan and revolving credit facilities [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 472.0   380.0 658.5 [1]
Facility A (US $380 Million) [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 380.0   380.0  
Name of borrower Orogen        
Maturity date 6 June 2020        
Facility A (US $380 Million) [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate LIBOR plus 2.25        
Facility B (US $360 Million) [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 92.0   0.0  
Name of borrower Orogen        
Commitment fee 0.68%        
Maturity date 6 June 2021        
Facility B (US $360 Million) [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate LIBOR plus 1.95        
Facility C (US $550 Million) [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 0.0   0.0  
Name of borrower Orogen        
Commitment fee 0.77%        
Maturity date 6 June 2021        
Facility C (US $550 Million) [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate LIBOR plus 2.20        
US$1,200 million revolving credit facilities [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 0.0   0.0  
Facility A (US$600 million 3-year revolving credit facility) [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 0.0   0.0  
Name of borrower Orogen/Ghana        
Commitment fee 0.51%        
Maturity date 25 July 2022        
Facility A (US$600 million 3-year revolving credit facility) [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate LIBOR plus 1.45        
Facility B (US$600 million 5-year revolving credit facility) [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 0.0   0.0  
Name of borrower Orogen/Ghana        
Commitment fee 0.60%        
Maturity date 25 July 2024        
Facility B (US$600 million 5-year revolving credit facility) [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate LIBOR plus 1.70        
R 1,500 Million Nedbank Revolving Credit Facility - old [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 0.0   79.5 0.0
Name of borrower GFIJVH/GFO        
Commitment fee 0.85%        
Maturity date 7 March 2018        
R 1,500 Million Nedbank Revolving Credit Facility - old [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate JIBAR plus 2.50        
R 1,500 million Nedbank revolving credit facility - new [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 0.0   0.0  
Name of borrower GFIJVH/GFO        
Commitment fee 0.90%        
Maturity date 8 May 2023        
R 1,500 million Nedbank revolving credit facility - new [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate JIBAR plus 2.80        
R 500 million Standard Bank revolving credit facility [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 13.7   0.0 0.0 [1]
Name of borrower GFIJVH/GFO        
Commitment fee 1.05%        
Maturity date 31 March 2020        
R 500 million Standard Bank revolving credit facility [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate JIBAR plus 2.75        
R 500 million Absa Bank revolving credit facility [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 34.2   0.0 0.0 [1]
Name of borrower GFIJVH/GFO        
Commitment fee 0.8925%        
Maturity date 31 March 2020        
R 500 million Absa Bank revolving credit facility [member] | Fixed Interest Rate [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal interest rate JIBAR plus 2.55        
Short-term Rand Uncommitted Credit Facilities [member]          
Disclosure of detailed information about borrowings [line items]          
Total borrowings $ 0.0 $ 92.5   $ 115.0 $ 61.0 [1]
Name of borrower 0        
Nominal interest rate 0        
Maturity date 0        
[1] Refer note 42.