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Split-Tenor Revolving Credit Facility (Detail) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2010 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Jun. 30, 2010 USD ($) | Dec. 31, 2012 ZAR | Nov. 28, 2012 USD ($) | Nov. 28, 2012 ZAR | Nov. 16, 2012 ZAR | Oct. 24, 2012 USD ($) | Oct. 24, 2012 ZAR | Dec. 31, 2012 Collateralized Split tenor revolving credit facility USD ($) | Dec. 31, 2011 Collateralized Split tenor revolving credit facility USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  |  |  | 3,000.0 | $ 700.1 | 6,000.0 | 1,000.0 | $ 58.3 | 500.0 | $ 500.0 |
Long and short-term loans raised | 1,543.8 | 1,451.0 | 1,167.9 | 1,619.9 |  |  |  |  |  |  |  | 540.0
Long and short-term loans repaid | (1,330.8) | (975.9) | (654.6) | (1,637.5) |  |  |  |  |  |  | (500.0) | (40.0)
Closing balance |  | $ 350.0 |  |  | 3,000.0 | $ 700.1 | 6,000.0 | 1,000.0 | $ 58.3 | 500.0 |  | $ 500.0

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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