Quarterly report pursuant to Section 13 or 15(d)

Acquisitions And Other Investments (Narrative) (Detail)

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Acquisitions And Other Investments (Narrative) (Detail)
6 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
May 12, 2011
Consolidated Thompson [Member]
USD ($)
May 12, 2011
Consolidated Thompson [Member]
CAD
Jun. 30, 2012
WISCO [Member]
Business Acquisition [Line Items]        
Cost per share acquired     17.25  
Consideration transferred, amount   $ 4,600,000,000    
Subsidiary or equity method investee percentage ownership acquired       25.00%
Pre-acquisition date Quebec mining duties tax 16,400,000      
Increase in Other Current Liabilities 6,100,000      
Increase in Other Noncurrent Liabilities 10,300,000      
Reduction of calculated minimum distribution payable to the minority partner 2,600,000      
Increase in goodwill 13,800,000      
Mineral rights 4,825,600,000      
Long-term deferred tax liabilities 1,041,800,000      
Noncontrolling interest in subsidiary 1,075,400,000      
Goodwill $ 997,300,000      
Goodwill tax deductibility None of the goodwill is expected to be deductible for income tax purposes.