Quarterly report pursuant to Section 13 or 15(d)

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

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Basis Of Presentation And Significant Accounting Policies (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Noncontrolling interest 21.00%  
Change in net income(loss)   $ 37.5
Black Label And Black Thor Chromite Deposits [Member]
   
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Ownership interest, percent 100.00%  
Big Daddy Chromite Deposit [Member]
   
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Ownership interest, percent 72.00%  
RenewaFUEL [Member]
   
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Income (loss) from discontinued operations 0.1 0.4
Immaterial Errors [Member]
   
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Change in income (loss) from continuing operations including portion attributable to noncontrolling interest   $ 8.4
Change in earnings per share basic and diluted   0.28