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Borrowings - Summary of Borrowings under Credit Facilities (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | $ 1,781.5 |  |
Loans advanced | 691.7 | $ 779.7 | $ 1,298.7
Repayments | (431.9) | (695.5) | (1,413.2)
Balance at end of the year | 2,011.6 | 1,781.5 |
Variable rate with exposure to repricing (six months or less) | 1,162.2 | 933.6 |
Undrawn borrowing facilities committed | 986.7 | 1,305.1 |
Uncommitted | 26.5 | 17.1 |
Total undrawn borrowing facilities | 1,013.2 | 1,322.2 |
Within one year [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Undrawn borrowing facilities committed | 0.0 | 39.7 |
Later Than One Year And Not Later Than Two Years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Undrawn borrowing facilities committed | 93.0 | 0.0 |
Later Than Two Years And Not Later Than Three Years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Undrawn borrowing facilities committed | 791.2 | 715.4 |
Later Than Three Years and Not Later Than Five Years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Undrawn borrowing facilities committed | 102.5 | 550.0 |
US Dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing denominated in currencies | 1,560.9 | 1,356.4 |
Australia, Dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing denominated in currencies | 316.5 | 231.5 |
Rand [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing denominated in currencies | 134.2 | 193.6 |
US $150 Million Revolving Senior Secured Credit Facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 | 82.0 |
Loans advanced | 0.0 | 0.0 |
Repayments | 0.0 | (82.0) |
Balance at end of the year | 0.0 | 0.0 | 82.0
US$150 million revolving senior secured credit facility - new [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 83.5 | 0.0 |
Loans advanced | 0.0 | 83.5 |
Balance at end of the year | 83.5 | 83.5 | 0.0
US$70 million revolving senior secured credit facility [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
US$100 million revolving senior secured credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 45.0 | 0.0 |
Loans advanced | 0.0 | 45.0 |
Balance at end of the year | 45.0 | 45.0 | 0.0
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 | 380.0 | 658.5 |
Loans advanced | 382.6 | 73.5 |
Repayments | (179.6) | (352.0) |
Balance at end of the year | 583.0 | 380.0 | 658.5
R 1,500 Million Nedbank Revolving Credit Facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 79.5 | 0.0 |
Loans advanced | 20.7 | 78.5 |
Repayments | (107.7) | 0.0 |
Translation adjustment | 7.5 | 1.0 |
Balance at end of the year | 0.0 | 79.5 | 0.0
US $1 Billion Notes [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 847.9 | 846.4 |
Unwinding of transaction costs | 1.5 | 1.5 |
Balance at end of the year | 849.4 | 847.9 | 846.4
Fixed rate with no exposure to repricing (US$1 billion notes issue) | 849.4 | 847.9 |
A $500 million syndicated revolving credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 231.5 | 0.0 |
Loans advanced | 119.9 | 236.6 |
Translation adjustment | (34.9) | (5.1) |
Balance at end of the year | 316.5 | 231.5 | 0.0
Short-term Rand Uncommitted Credit Facilities [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 114.1 | 61.0 |
Loans advanced | 118.7 | 262.6 |
Repayments | (144.6) | (216.5) |
Translation adjustment | (1.9) | 7.0 |
Balance at end of the year | 86.3 | 114.1 | $ 61.0
R 500 million Standard Bank revolving credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Balance at beginning of the year | 0.0 |  |
Loans advanced | (13.7) | 0.0 |
Translation adjustment | 0.0 | 0.0 |
Balance at end of the year | 13.7 | 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 |  |
Loans advanced | (36.1) | 0.0 |
Translation adjustment | (1.9) | 0.0 |
Balance at end of the year | $ 34.2 | $ 0.0 |

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