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Borrowings - Summary of Borrowings under Credit Facilities (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | $ 1,845.8 |  |
Repayments | (1,014.2) | $ (1,604.3) | $ (535.9)
Balance at end of the year | 1,526.9 | 1,845.8 |
Variable rate with exposure to repricing (six months or less) | 533.5 | 252.0 |
Fixed rate with no exposure to repricing | 993.4 | 1,593.8 |
Borrowing denominated in currencies | 1,526.9 | 1,845.8 |
Total committed undrawn borrowing facilities | 1,471.3 | 1,727.6 |
Uncommitted | 104.5 | 116.8 |
Total undrawn borrowing facilities | 1,471.3 | 1,727.6 |
Undrawn borrowing facilities net. | 1,575.8 | 1,844.4 |
Within one year [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total committed undrawn borrowing facilities | 166.5 | 137.9 |
Later Than One Year And Not Later Than Two Years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total committed undrawn borrowing facilities | 96.2 | 282.5 |
Later Than Two Years And Not Later Than Three Years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total committed undrawn borrowing facilities | 608.6 | 600.0 |
Later Than Three Years and Not Later Than Five Years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total committed undrawn borrowing facilities | 600.0 | 707.1 |
US Dollars [member] | Other Currencies Short-term borrowings [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing denominated in currencies | 1,326.9 | 1,677.3 |
Australia, Dollars [member] | Other Currencies Short-term borrowings [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing denominated in currencies | 200.0 | 168.5 |
Rand [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing denominated in currencies | 0.0 | 0.0 |
US $1 Billion Notes [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 601.4 |  |
Balance at end of the year | 0.0 | 601.4 |
US $1 Billion Notes [member] | US Dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 601.4 | 849.4 |
Buy-back of US$250 million notes | 0.0 | (255.0) |
Loss on buy-back of notes | 0.0 | 5.0 |
Unwinding of transaction costs | 0.9 | 2.0 |
Repayments | (602.3) | 0.0 |
Balance at end of the year | 0.0 | 601.4 | 849.4
US$500 million 5-year notes issue [member] | US Dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 496.3 | 0.0 |
Loans advanced | 0.0 | 500.0 |
transaction costs | 0.0 | (4.1) |
Unwinding of transaction costs | 0.7 | 0.4 |
Balance at end of the year | 497.0 | 496.3 | 0.0
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 | 496.1 |  |
Balance at end of the year | 496.4 | 496.1 |
US$500 million 10-year notes issue (the 10-year notes) [member] | US Dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 496.1 | 0.0 |
Loans advanced | 0.0 | 500.0 |
transaction costs | 0.0 | (4.1) |
Unwinding of transaction costs | 0.3 | 0.2 |
Balance at end of the year | 496.4 | 496.1 | 0.0
US$150 million revolving senior secured credit facility - old [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 83.5 |  |
Balance at end of the year | 83.5 | 83.5 |
US$150 million revolving senior secured credit facility - old [member] | US Dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 83.5 | 83.5 |
Balance at end of the year | 83.5 | 83.5 | 83.5
US$100 million revolving credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 |  |
Balance at end of the year | 0.0 | 0.0 |
US$100 million revolving credit facility [member] | US Dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 | 45.0 |
Repayments | 0.0 | (45.0) |
Balance at end of the year | 0.0 | 0.0 | 45.0
R 500 million Standard Bank revolving credit facility [member] | Rand [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 | 13.7 |
Loans advanced | 0.0 | 21.2 |
Repayments | 0.0 | (35.1) |
Translation adjustment | 0.0 | 0.2 |
Balance at end of the year | 0.0 | 0.0 | 13.7
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 | 0.0 | 472.0 |
Loans advanced | 0.0 | 434.4 |
Repayments | 0.0 | (906.4) |
Balance at end of the year | 0.0 | 0.0 | 472.0
US$1,200 million revolving credit facilities [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 | 0.0 |
Loans advanced | 413.0 | 0.0 |
Repayments | (163.0) | 0.0 |
Balance at end of the year | 250.0 | 0.0 | 0.0
R 500 million Absa Bank revolving credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 |  |
Balance at end of the year | 0.0 | 0.0 |
R 500 million Absa Bank revolving credit facility [member] | Rand [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 | 34.2 |
Repayments | 0.0 | (34.5) |
Translation adjustment | 0.0 | 0.3 |
Balance at end of the year | 0.0 | 0.0 | 34.2
Short-term Rand Uncommitted Credit Facilities [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 |  |
Balance at end of the year | 0.0 | 0.0 |
Short-term Rand Uncommitted Credit Facilities [member] | Rand [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 | 92.5 |
Loans advanced | 0.0 | 90.6 |
Repayments | 0.0 | (184.7) |
Translation adjustment | 0.0 | 1.6 |
Balance at end of the year | 0.0 | 0.0 | 92.5
AU $ 500 Million Syndicated Revolving Credit Facility Old [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 168.5 |  |
Balance at end of the year | 0.0 | 168.5 |
AU $ 500 Million Syndicated Revolving Credit Facility Old [Member] | Australia, Dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 168.5 | 316.5 |
Loans advanced | 85.8 | 0.0 |
Repayments | (248.9) | (143.6) |
Translation adjustment | (5.4) | (4.4) |
Balance at end of the year | 0.0 | 168.5 | $ 316.5
AU $ 500 Million Syndicated Revolving Credit Facility New [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 |  |
Loans advanced | 191.0 | 0.0 |
Translation adjustment | 9.0 | 0.0 |
Balance at end of the year | $ 200.0 | $ 0.0 |

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