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Quarterly report pursuant to Section 13 or 15(d)

Basis Of Presentation And Significant Accounting Policies (Narrative) (Detail)

v2.4.0.6
Basis Of Presentation And Significant Accounting Policies (Narrative) (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Related Party Transaction [Line Items] Ìý Ìý Ìý Ìý
Change in net income(loss) Ìý $ 30.4 Ìý $ 67.9
Noncontrolling interest Ìý 21.00% Ìý 21.00%
Renewafuel [Member]
Ìý Ìý Ìý Ìý
Related Party Transaction [Line Items] Ìý Ìý Ìý Ìý
Income (loss) from discontinued operations 0 (0.7) (0.1) (1.1)
Immaterial Errors [Member]
Ìý Ìý Ìý Ìý
Related Party Transaction [Line Items] Ìý Ìý Ìý Ìý
Change in income (loss) from continuing operations including portion attributable to noncontrolling interest Ìý $ 7.7 Ìý $ 16.1
Change in earnings per share basic and diluted Ìý $ 0.22 Ìý $ 0.49
Black Label And Black Thor Chromite Deposits [Member]
Ìý Ìý Ìý Ìý
Related Party Transaction [Line Items] Ìý Ìý Ìý Ìý
Ownership interest, percent 100.00% Ìý 100.00% Ìý
Big Daddy Chromite Deposit [Member]
Ìý Ìý Ìý Ìý
Related Party Transaction [Line Items] Ìý Ìý Ìý Ìý
Ownership interest, percent 72.00% Ìý 72.00% Ìý