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Fair Value of Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Estimated Fair Values of the Group's Financial Assets and Liabilities | The estimated fair values of the Group’s financial assets and liabilities are:
|  | 2017 |  |  | 2016 |
|  | Carrying amount US$ million |  |  | Fair value US$ million |  |  | Carrying amount US$ million |  |  | Fair value US$ million |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 479.0 |  |  |  | 479.0 |  |  |  | 526.7 |  |  |  | 526.7 |
Trade and other receivables |  |  | 66.5 |  |  |  | 66.5 |  |  |  | 68.5 |  |  |  | 68.5 |
Gold and oil derivative contracts |  |  | 25.0 |  |  |  | 25.0 |  |  |  | — |  |  |  | — |
Environmental trust fund |  |  | 55.5 |  |  |  | 55.5 |  |  |  | 44.5 |  |  |  | 44.5 |
Investments |  |  | 104.6 |  |  |  | 104.6 |  |  |  | 19.7 |  |  |  | 19.7 |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade and other payables |  |  | 451.0 |  |  |  | 451.0 |  |  |  | 459.3 |  |  |  | 459.3 |
Borrowings |  |  | 1,587.9 |  |  |  | 1,611.5 |  |  |  | 1,504.9 |  |  |  | 1,496.7 |
Current portion of borrowings |  |  | 193.6 |  |  |  | 193.6 |  |  |  | 188.0 |  |  |  | 188.0 |
Copper derivative contracts |  |  | 3.3 |  |  |  | 3.3 |  |  |  | — |  |  |  | — |
South Deep dividend |  |  | 6.4 |  |  |  | 6.4 |  |  |  | 6.4 |  |  |  | 6.4 |
Schedule of Group's Assets and Liabilities Measured at Fair Value by Level Within the Fair Value Hierarchy | The following table sets out the Group’s assets and liabilities measured at fair value by level within the fair value hierarchy at the reporting date:
UNITED STATES DOLLAR |  |  |  | UNITED STATES DOLLAR
2016 |  |  |  | 2017
Level 1 |  | Level 2 |  | Level 3 |  | Total |  |  |  | Total |  | Level 1 |  | Level 2 |  | Level 3
|  |  |  |  |  |  |  | Assets measured at fair value |  |  |  |  |  |  |  |
— |  | 10.6 |  | — |  | 10.6 |  | Trade receivables from provisional copper and gold concentrate sales |  | 21.2 |  | — |  | 21.2 |  | —
10.5 |  | — |  | — |  | 10.5 |  | Listed investments |  | 99.0 |  | 99.0 |  | — |  | —
— |  | 5.9 |  | — |  | 5.9 |  | Derivative instruments |  | 5.5 |  | — |  | 5.5 |  | —
— |  | — |  | — |  | — |  | Oil derivative contracts |  | 14.1 |  | — |  | 14.1 |  | —
— |  | — |  | — |  | — |  | Gold derivative contracts |  | 10.9 |  | — |  | 10.9 |  | —
|  |  |  |  |  |  |  | Liabilities measured at fair value |  |  |  |  |  |  |  |
— |  | — |  | — |  | — |  | Copper derivative contracts |  | 3.3 |  | — |  | 3.3 |  | —

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- Definition The entire disclosure for fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The disclosure of information sufficient to permit the reconciliation of classes of assets determined for fair value measurement to the line items in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 94 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_94&doctype=Standard -URIDate 2017-03-09 + Details
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