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Fair Value Measurements (Debt Instruments) (Details) link:presentationLink link:calculationLink link:definitionLink 2420403 - Disclosure - Fair Value Measurements (Financial Instruments Measured at Fair Value on a Recurring Basis) (Details) link:presentationLink link:calculationLink link:definitionLink 2420402 - Disclosure - Fair Value Measurements (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 2420404 - Disclosure - Fair Value Measurements (Reconciliation Using Significant Unobservable Inputs) (Details) link:presentationLink link:calculationLink link:definitionLink 2320301 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 2115100 - Disclosure - Guarantees link:presentationLink link:calculationLink link:definitionLink 2415401 - Disclosure - Guarantees (Details) link:presentationLink link:calculationLink link:definitionLink 2111100 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 2411404 - 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Disclosure - Performance Bonds and Guaranty Fund Contributions link:presentationLink link:calculationLink link:definitionLink 2405404 - Disclosure - Performance Bonds and Guaranty Fund Contributions (Cash and Securities Held as Performance Bonds and Guaranty Fund Contributions at Fair Value) (Details) link:presentationLink link:calculationLink link:definitionLink 2405403 - Disclosure - Performance Bonds and Guaranty Fund Contributions (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 2405405 - Disclosure - Performance Bonds and Guaranty Fund Contributions (Performance Bond Deposits and Security Deposits) (Details) link:presentationLink link:calculationLink link:definitionLink 2405406 - Disclosure - Performance Bonds and Guaranty Fund Contributions Performance Bond Reinvestment (Details) link:presentationLink link:calculationLink link:definitionLink 2305302 - Disclosure - Performance Bonds and Guaranty Fund Contributions Reinvested Collateral (Tables) link:presentationLink link:calculationLink link:definitionLink 2305301 - 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