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Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
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Mar. 31, 2012
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Jun. 30, 2012
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| Net deferred tax assets | 听 | $ 314.7 |
| Net financial statement tax expense | 60.5 | 听 |
| Financial statement impact of which was an income tax benefit | $ 26.9 | 听 |
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Scenario, Forecast [Member] | Iron Ore And Coal Mining Profits [Member]
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听 | 听 |
| Positive impact on the estimated annual effective tax rate | 听 | 20.70% |
| X | ||||||||||
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- Definition
Expected Tax Rate No definition available.
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| X | ||||||||||
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- Definition
The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The estimated loss resulting from the income tax examination that has been accrued as of the balance sheet date, including interest and penalties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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