Quarterly report pursuant to Section 13 or 15(d)

Acquisitions And Other Investments (Narrative) (Details)

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Acquisitions And Other Investments (Narrative) (Details)
 1 Months Ended 3 Months Ended 3 Months Ended
Jan. 31, 2012
T
Mar. 31, 2012
USD ($)
Mar. 31, 2012
Consolidated Thompson [Member]
T
Jun. 30, 2011
Consolidated Thompson [Member]
T
May 12, 2011
Consolidated Thompson [Member]
USD ($)
May 12, 2011
Consolidated Thompson [Member]
CAD
Mar. 31, 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%
Initial production rate, metric tons 16,000,000   8,000,000 16,000,000      
Mineral rights   4,825,600,000          
Long-term deferred tax liabilities   1,041,800,000          
Noncontrolling interest in subsidiary   1,075,400,000          
Increase in Other Current Liabilities   6,100,000          
Increase in Other Noncurrent Liabilities   10,300,000          
Pre-acquisition date Quebec mining duties tax   16,400,000          
Reduction of calculated minimum distribution payable to the minority partner   (2,600,000)          
Increase in goodwill   13,800,000          
Preliminary goodwill   $ 997,300,000          
Goodwill tax deductibility   None of the preliminary goodwill is expected to be deductible for income tax purposes.