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Borrowings - Summary of Borrowings under Credit Facilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] $ 1,906.8 $ 1,782.4  
Loans advanced 1,538.0 690.0 [1] $ 787.6 [1]
Repayments (1,604.3) (535.9) [1] (702.5) [1]
Balance at end of the year 1,845.8 1,906.8 [1] 1,782.4 [1]
Fixed rate with no exposure to repricing (US$1 billion notes issue) 1,593.8 849.4 [1] 847.9 [1]
Variable rate with exposure to repricing (six months or less) 252.0 1,057.4 [1] 934.5 [1]
Undrawn borrowing facilities committed 1,727.6 1,097.7 [1] 1,305.1 [1]
Uncommitted 116.8 20.3 [1] 16.2 [1]
Total undrawn borrowing facilities 1,844.4 1,118.0 [1] 1,321.3 [1]
Within one year [member]      
Disclosure of detailed information about borrowings [line items]      
Undrawn borrowing facilities committed 137.9 0.0 [1] 39.7 [1]
Later Than One Year And Not Later Than Two Years [member]      
Disclosure of detailed information about borrowings [line items]      
Undrawn borrowing facilities committed 282.5 93.0 [1] 0.0 [1]
Later Than Two Years And Not Later Than Three Years [member]      
Disclosure of detailed information about borrowings [line items]      
Undrawn borrowing facilities committed 600.0 902.2 [1] 715.4 [1]
Later Than Three Years and Not Later Than Five Years [member]      
Disclosure of detailed information about borrowings [line items]      
Undrawn borrowing facilities committed 707.1 102.5 [1] 550.0 [1]
US Dollars [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowing denominated in currencies 1,677.3 1,449.9 [1] 1,356.4 [1]
Australia, Dollars [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowing denominated in currencies 168.5 316.5 [1] 231.5 [1]
Rand [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowing denominated in currencies 0.0 140.4 [1] 194.5 [1]
US $1 Billion Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 849.4 847.9 846.4
Buy-back of notes (255.0) 0.0 [1] 0.0 [1]
Loss on buy-back of notes 5.0 0.0 [1] 0.0 [1]
Unwinding of transaction costs 2.0 1.5 [1] 1.5 [1]
Balance at end of the year 601.4 849.4 [1] 847.9 [1]
US$500 million 5-year notes issue [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 0.0 0.0  
Loans advanced 500.0 0.0 [1]  
transaction costs (4.1) 0.0 [1] 0.0 [1]
Unwinding of transaction costs 0.4 0.0 [1] 0.0 [1]
Loans advanced [1]     0.0
Balance at end of the year 496.3 0.0 [1] 0.0 [1]
US$500 million 10-year notes issue (the 10-year notes) [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 0.0 0.0  
Loans advanced 500.0 0.0 [1]  
transaction costs (4.1) 0.0 [1] 0.0 [1]
Unwinding of transaction costs 0.2 0.0 [1] 0.0 [1]
Loans advanced [1]     0.0
Balance at end of the year 496.1 0.0 [1] 0.0 [1]
US$150 million revolving senior secured credit facility - old [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 0.0 0.0 82.0
Repayments 0.0 0.0 [1] (82.0) [1]
Balance at end of the year 0.0 0.0 [1] 0.0 [1]
US$150 million revolving senior secured credit facility - New [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 83.5 83.5 0.0
Loans advanced 0.0 0.0 [1] 83.5 [1]
Balance at end of the year 83.5 83.5 [1] 83.5 [1]
US$70 million revolving senior secured credit facility [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 0.0 0.0 45.0
Repayments 0.0 0.0 [1] (45.0) [1]
Balance at end of the year 0.0 0.0 [1] 0.0 [1]
US$100 million revolving senior secured credit facility [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 45.0 45.0 0.0
Loans advanced [1]     45.0
Loans advanced 0.0 0.0 [1]  
Repayments (45.0) 0.0 [1] 0.0 [1]
Balance at end of the year 0.0 45.0 [1] 45.0 [1]
A $500 million syndicated revolving credit facility [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 316.5 231.5 0.0
Loans advanced [1]     236.6
Loans advanced 0.0 119.9 [1]  
Repayments (143.6) 0.0 [1] 0.0 [1]
Translation adjustment (4.4) (34.9) [1] (5.1) [1]
Balance at end of the year 168.5 316.5 [1] 231.5 [1]
R 500 million Standard Bank revolving credit facility [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 13.7 0.0 0.0
Loans advanced [1]     0.0
Loans advanced 21.2 13.7 [1]  
Repayments (35.1) 0.0 [1] 0.0 [1]
Translation adjustment 0.2 0.0 [1] 0.0 [1]
Balance at end of the year 0.0 13.7 [1] 0.0 [1]
R 1,500 Million Nedbank Revolving Credit Facility [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year 0.0 [1] 79.5 [1] 0.0
Loans advanced     78.5
Loans advanced 0.0 20.7 [1]  
Repayments 0.0 (107.7) [1] 0.0
Translation adjustment 0.0 7.5 [1] 1.0
Balance at end of the year 0.0 0.0 [1] 79.5 [1]
US$1,290 million term loan and revolving credit facilities [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 472.0 380.0 658.5
Loans advanced 434.4 382.6 [1] 73.5 [1]
Repayments (906.4) (290.6) [1] (352.0) [1]
Balance at end of the year 0.0 472.0 [1] 380.0 [1]
R 500 million Absa Bank revolving credit facility [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 34.2 0.0 0.0
Loans advanced [1]     0.0
Loans advanced 0.0 36.1 [1]  
Repayments (34.5) 0.0 [1] 0.0 [1]
Translation adjustment 0.3 (1.9) [1] 0.0 [1]
Balance at end of the year 0.0 34.2 [1] 0.0 [1]
Short-term Rand Uncommitted Credit Facilities [member]      
Disclosure of detailed information about borrowings [line items]      
Balance at beginning of the year [1] 92.5 115.0 61.0
Loans advanced [1]     270.5
Loans advanced 90.6 117.0 [1]  
Repayments (184.7) (137.6) [1] (223.5) [1]
Translation adjustment 1.6 (1.9) [1] 7.0 [1]
Balance at end of the year $ 0.0 $ 92.5 [1] $ 115.0 [1]
[1] Refer note 42.