Quarterly report pursuant to Section 13 or 15(d)

Basis Of Presentation And Significant Accounting Policies (Investments In Unconsolidated Ventures) (Detail)

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Sep. 30, 2012
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]    
Investment $ 488.3 $ 504.8
Amapa [Member] | Investments In Ventures [Member]
   
Schedule of Equity Method Investments [Line Items]    
Percent ownership interest 30.00%  
Investment 479.2 498.6
Cockatoo [Member] | Other Liabilities [Member]
   
Schedule of Equity Method Investments [Line Items]    
Percent ownership interest 50.00%  
Investment (28.7) (15.0)
Hibbing [Member] | Other Liabilities [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment 0.8 (6.8)
Other Equity Investees [Member] | Investments In Ventures [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment $ 37.0 $ 28.0