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Commitments and Contingencies (Policies)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]    
Environmental Costs, Policy
Environmental expenditures are capitalized when such expenditures are expected to result in future economic benefits.
Environmental Liabilities
We recognize environmental liabilities when a loss is probable and reasonably estimable. Such accruals are estimated based on currently available information, existing technology and enacted laws and regulations. Such estimates are based primarily upon the estimated cost of investigation and remediation required and the likelihood that other potentially responsible parties will be able to fulfill their commitments at the sites where we may be jointly and severally liable with such parties. We regularly evaluate and revise estimates for environmental obligations based on expenditures against established reserves and the availability of additional information.