Quarterly report pursuant to Section 13 or 15(d)

Acquisitions And Other Investments (Schedule Of Allocation Of Purchase Price) (Detail)

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Acquisitions And Other Investments (Schedule Of Allocation Of Purchase Price) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Business Acquisition [Line Items]  
Mineral rights $ 4,825.6
Long-term deferred tax liabilities 1,041.8
Noncontrolling interest in Bloom Lake (1,075.4)
Goodwill 997.3
Consolidated Thompson [Member] | Initial Allocation [Member]
  
Business Acquisition [Line Items]  
Cash 4,554.0
Fair value of total consideration transferred 4,554.0
Cash 130.6
Accounts receivable 102.8
Product inventories 134.2
Other current assets 35.1
Mineral rights 4,450.0
Property, plant and equipment 1,193.4
Intangible assets 2.1
Total identifiable assets acquired 6,048.2
Accounts payable (13.6)
Accrued liabilities (130.0)
Convertible debentures (335.7)
Other current liabilities (41.8)
Long-term deferred tax liabilities (831.5)
Senior secured notes (125.0)
Capital lease obligations (70.7)
Other long-term liabilities (25.1)
Total identifiable liabilities assumed (1,573.4)
Total identifiable net assets acquired 4,474.8
Noncontrolling interest in Bloom Lake (947.6)
Goodwill 1,026.8
Total net assets acquired 4,554.0
Consolidated Thompson [Member] | Final Allocation [Member]
  
Business Acquisition [Line Items]  
Cash 4,554.0
Fair value of total consideration transferred 4,554.0
Cash 130.6
Accounts receivable 102.4
Product inventories 134.2
Other current assets 35.1
Mineral rights 4,825.6
Property, plant and equipment 1,193.4
Intangible assets 2.1
Total identifiable assets acquired 6,423.4
Accounts payable (13.6)
Accrued liabilities (123.8)
Convertible debentures (335.7)
Other current liabilities (47.9)
Long-term deferred tax liabilities (1,041.8)
Senior secured notes (125.0)
Capital lease obligations (70.7)
Other long-term liabilities (32.8)
Total identifiable liabilities assumed (1,791.3)
Total identifiable net assets acquired 4,632.1
Noncontrolling interest in Bloom Lake (1,075.4)
Goodwill 997.3
Total net assets acquired 4,554.0
Consolidated Thompson [Member] | Change [Member]
  
Business Acquisition [Line Items]  
Cash 0
Fair value of total consideration transferred 0
Cash 0
Accounts receivable (0.4)
Product inventories 0
Other current assets 0
Mineral rights 375.6
Property, plant and equipment 0
Intangible assets 0
Total identifiable assets acquired 375.2
Accounts payable 0
Accrued liabilities 6.2
Convertible debentures 0
Other current liabilities (6.1)
Long-term deferred tax liabilities (210.3)
Senior secured notes 0
Capital lease obligations 0
Other long-term liabilities (7.7)
Total identifiable liabilities assumed (217.9)
Total identifiable net assets acquired 157.3
Noncontrolling interest in Bloom Lake (127.8)
Goodwill (29.5)
Total net assets acquired $ 0