AG真人平台AG真人试玩

Annual report pursuant to Section 13 and 15(d)

Environmental And Mine Closure Obligations (Narrative) (Details)

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Environmental And Mine Closure Obligations (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Allocation Agreement [Member]
Dec. 31, 2010
Allocation Agreement [Member]
May 29, 2009
Allocation Agreement [Member]
Dec. 31, 2011
Previously Owned Or Operating Facilities [Member]
L T V AG真人平台AG真人试玩 Mining Company [Member]
Dec. 31, 2010
Previously Owned Or Operating Facilities [Member]
L T V AG真人平台AG真人试玩 Mining Company [Member]
Loss Contingencies [Line Items] 听 听 听 听 听 听 听
Payments related to environmental and mine closure liabilities $ 1.9 $ 10.6 听 听 听 听 听
Environmental Obligation Funding Percentage 听 听 听 听 32.50% 听 听
Allocation agreement, commited remedy, percent 听 听 听 听 32.50% 听 听
Environmental liabilities 15.5 13.7 10.0 9.2 听 听 听
Estimated costs of the available remediation alternatives minimum amount 10.0 听 听 听 听 听 听
Estimated costs of the available remediation alternatives maximum amount 30.5 听 听 听 听 听 听
Mine closure obligation 220.2 185.4 听 听 听 16.5 17.1
Rate of inflation 3.50% 听 听 听 听 听 听
Total environmental and mine closure obligations $ 235.7 $ 199.1 听 听 听 听 听