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Deferred Income and Mining Tax Liabilities and Assets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Deferred income and mining tax liabilities |  |
Mining assets | $ 1,047.6 | $ 1,608.0
Investments held by environmental trust funds | 2.7 | 45.3
Inventory | 18.2 | 15.3
Other | 19.5 | 13.1
Gross deferred income and mining tax liabilities | 1,088.0 | 1,681.7
Provisions, including rehabilitation accruals | (103.7) | (144.6)
Tax losses | (159.8) | (183.0)
Unredeemed capital expenditure | (876.9) | (782.9)
Other | (4.1) |
Gross deferred income and mining tax assets | (1,144.5) | (1,110.5)
Valuation allowance for deferred tax assets | 330.2 | 324.4
Total deferred income and mining tax assets | (814.3) | (786.1)
Total deferred income and mining tax liabilities | 273.7 | 895.6
Less: short-term portion of deferred income and mining tax liabilities | (16.0) | (17.9)
Less: short-term portion of deferred income and mining tax assets | 29.0 |
Long-term portion of deferred income and mining taxes | 286.7 | 877.7
Long-term liabilities | (309.3) | (901.8)
Long-term assets | $ 22.6 | $ 24.1

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- Definition The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of investment by environmental trust funds and the basis of investment by environmental trust funds computed in accordance with generally accepted accounting principles. + References No definition available. + Details
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