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Borrowings - Summary of Borrowings under Credit Facilities (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Balance at beginning of the year | $ 1,692.9 |  |  |  |
Variable rate with exposure to repricing (six months or less) | 933.6 | $ 846.5 |  |  |
Loans advanced | 779.7 | 1,298.7 | [1] | $ 506.0 | [1]
Profit on buy-back of notes | 0.0 | (17.7) |  | 0.0 |
Repayments | 695.5 | 1,413.2 | [1] | 594.3 | [1]
Balance at end of the year | 1,781.5 | 1,692.9 |  |  |
Undrawn borrowing facilities committed | 1,452.7 | 979.0 |  |  |
Uncommitted | 17.1 | 56.6 |  |  |
Total undrawn borrowing facilities | 1,469.8 | 1,035.6 |  |  |
Within one year [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Undrawn borrowing facilities committed | 39.7 | 93.0 |  |  |
Later Than One Year And Not Later Than Two Years [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Undrawn borrowing facilities committed | 0.0 | 106.9 |  |  |
Later Than Two Years And Not Later Than Three Years [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Undrawn borrowing facilities committed | 863.0 | 81.5 |  |  |
Later Than Three Years and Not Later Than Five Years [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Undrawn borrowing facilities committed | 550.0 | 697.6 |  |  |
US Dollars [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowing denominated in currencies | 1,356.4 | 1,631.9 |  |  |
Australia, Dollars [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowing denominated in currencies | 231.5 | 0.0 |  |  |
Rand [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowing denominated in currencies | 193.6 | 61.0 |  |  |
US $1 Billion Notes [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Balance at beginning of the year | 846.4 | 992.6 |  |  |
Buy-back of US$200 million notes | 0.0 | (129.9) |  |  |
Profit on buy-back of notes | 0.0 | (17.7) |  |  |
Unwinding of transaction costs | 1.5 | 1.4 |  |  |
Balance at end of the year | 847.9 | 846.4 |  | 992.6 |
Fixed rate with no exposure to repricing (US$1 billion notes issue) | 847.9 | 846.4 |  |  |
US $150 Million Revolving Senior Secured Credit Facility [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Balance at beginning of the year | 82.0 | 42.0 |  |  |
Loans advanced | 0.0 | 40.0 |  |  |
Repayments | (82.0) | 0.0 |  |  |
Balance at end of the year | 0.0 | 82.0 |  | 42.0 |
US$150 million revolving senior secured credit facility - new [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Balance at beginning of the year | 0.0 | 0.0 |  |  |
Loans advanced | 83.5 | 0.0 |  |  |
Balance at end of the year | 83.5 | 0.0 |  | 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 | 658.5 | 0.0 |  |  |
Loans advanced | 73.5 | 707.5 |  |  |
Repayments | (352.0) | (49.0) |  |  |
Balance at end of the year | 380.0 | 658.5 |  | 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 | 45.0 | 45.0 |  |  |
Repayments | (45.0) | 0.0 |  |  |
Balance at end of the year | 0.0 | 45.0 |  | 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 | 0.0 | 0.0 |  |  |
Loans advanced | 45.0 | 0.0 |  |  |
Balance at end of the year | 45.0 | 0.0 |  | 0.0 |
A $500 million syndicated revolving credit facility [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Balance at beginning of the year | 0.0 | 0.0 |  |  |
Loans advanced | 236.6 | 0.0 |  |  |
Translation adjustment | (5.1) | 0.0 |  |  |
Balance at end of the year | 231.5 | 0.0 |  | 0.0 |
US$1,510 Million Term Loan and Revolving Credit Facilities [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Balance at beginning of the year | 0.0 | 724.0 |  |  |
Loans advanced | 0.0 | 174.0 |  |  |
Repayments | 0.0 | (898.0) |  |  |
Balance at end of the year | 0.0 | 0.0 |  | 724.0 |
Short-term Rand Uncommitted Credit Facilities [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Balance at beginning of the year | 61.0 | 16.7 |  |  |
Loans advanced | 262.6 | 356.4 |  |  |
Repayments | (216.5) | (315.0) |  |  |
Translation adjustment | 7.0 | 2.9 |  |  |
Balance at end of the year | 114.1 | 61.0 |  | 16.7 |
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 | 0.0 |  |  |
Loans advanced | 78.5 | 20.8 |  |  |
Repayments | 0.0 | (21.3) |  |  |
Translation adjustment | 1.0 | 0.5 |  |  |
Balance at end of the year | $ 79.5 | $ 0.0 |  | $ 0.0 |
[1] | The restatement is as a result of the discontinued operations.

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