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Estimated Fair Values of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2010 | Jun. 30, 2009
--- | --- | --- | --- | --- | ---
Financial assets |  |  |  |  |  |  |
Cash and cash equivalents | $ 655.6 |  | $ 744.0 |  | $ 809.5 | $ 500.7 | $ 357.5
Receivables | 522.7 |  | 483.4 |  |  |  |
Non-current investments | 458.0 |  | 272.2 |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Long-term loans | 2,321.2 |  | 1,360.7 |  |  |  |
Accounts payable and provisions | 751.9 |  | 669.9 |  |  |  |
Interest payable | 11.0 |  | 11.2 |  |  |  |
Short-term loans and current portion of long-term loans | 40.0 | [1] | 547.0 | [1] |  |  |
Other non-current liabilities | 13.9 |  | 13.5 |  |  |  |
Carrying (Reported) Amount, Fair Value Disclosure |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |
Cash and cash equivalents | 655.6 |  | 744.0 |  |  |  |
Receivables | 314.5 |  | 220.1 |  |  |  |
Non-current investments | 458.0 | [2] | 272.2 | [2] |  |  |
Financial liabilities |  |  |  |  |  |  |
Long-term loans | 2,321.2 |  | 1,360.7 |  |  |  |
Accounts payable and provisions | 678.1 |  | 601.6 |  |  |  |
Interest payable | 11.0 |  | 11.2 |  |  |  |
Short-term loans and current portion of long-term loans | 40.0 |  | 547.0 |  |  |  |
Other non-current liabilities | 13.9 |  | 13.5 |  |  |  |
Fair value |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |
Cash and cash equivalents | 655.6 |  | 744.0 |  |  |  |
Receivables | 314.5 |  | 220.1 |  |  |  |
Non-current investments | 464.6 | [2] | 271.2 | [2] |  |  |
Financial liabilities |  |  |  |  |  |  |
Long-term loans | 2,322.4 |  | 1,263.0 |  |  |  |
Accounts payable and provisions | 678.1 |  | 601.6 |  |  |  |
Interest payable | 11.0 |  | 11.2 |  |  |  |
Short-term loans and current portion of long-term loans | 40.0 |  | 547.0 |  |  |  |
Other non-current liabilities | $ 13.9 |  | $ 13.5 |  |  |  |
[1] | The maturity of the loans has been updated to reflect post year end refinancing terms.
[2] | Fair value determined by using cost for Rand Refinery Limited and Far South East due to a market value not being readily available.

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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 7 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e7018-107765 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6935-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 + Details
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