Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS (Schedule Of Allocation Of Purchase Price) (Details)

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ACQUISITIONS (Schedule Of Allocation Of Purchase Price) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Consolidated Thompson [Member]
Jun. 30, 2011
Consolidated Thompson [Member]
Initial Allocation [Member]
May 12, 2011
Consolidated Thompson [Member]
Initial Allocation [Member]
Jun. 30, 2011
Consolidated Thompson [Member]
Final Allocation [Member]
Jun. 30, 2012
Consolidated Thompson [Member]
Final Allocation [Member]
Jun. 30, 2011
Consolidated Thompson [Member]
Change [Member]
Jun. 30, 2012
Consolidated Thompson [Member]
Change [Member]
Business Acquisition [Line Items]                    
Cash         $ 4,554.0   $ 4,554.0   $ 0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents           130.6   130.6   0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables           102.8   102.4   (0.4)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory           134.2   134.2   0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other           35.1   35.1   0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Mineral Rights       4,825.6   4,450.0   4,825.6   375.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment           1,193.4   1,193.4    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill           2.1   2.1   0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets           6,048.2   6,423.4   375.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable           13.6   13.6   0
Business Combination, Recognized Identifiable Asset Acquired and Liabilities Assumed, Convertible Debentures           335.7   335.7   0
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Liabilities           130.0   123.8   (6.2)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other           41.8   47.9   6.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent       1,041.8   (831.5)   (1,041.8)   (210.3)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt           125.0   125.0   0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation           70.7   70.7   0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other           25.1   32.8   7.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities           1,573.4   1,791.3   217.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net           4,474.8   4,632.1   157.3
Noncontrolling interest       (1,075.4)   (947.6)   (1,075.4)   (127.8)
Goodwill 74.5 167.4 1,152.1     1,026.8   997.3   (29.5)
Total net assets acquired         $ 4,554.0   $ 4,554.0   $ 0