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Commitments and Contingencies Legal Proceedings (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Defined benefit plan, cost of providing special or contractual termination benefits recognized during period $ 28.7us-gaap_DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod