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Disclosure - Commitments And Contingencies (Schedule Of Future Minimum Rental Payments For Operating Leases) (Details) link:presentationLink link:calculationLink link:definitionLink 41204 - Disclosure - Stockholders' Equity (Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax) (Details) link:presentationLink link:calculationLink link:definitionLink 41302 - Disclosure - Incentive Plans (Schedule Of Expense Relating To RSUs, Charged To Compensation And Benefits Expense And Restructuring Expense) (Details) link:presentationLink link:calculationLink link:definitionLink 41402 - Disclosure - Employee Benefit Plans (Schedule Of Net Periodic Benefit Costs (Credit)) (Details) link:presentationLink link:calculationLink link:definitionLink 00090 - Document - Document And Entity Information link:presentationLink link:calculationLink link:definitionLink 00105 - Statement - Condensed Consolidated Statements Of Financial Condition (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00405 - Statement - Condensed Consolidated Statements Of Changes In Stockholders' Equity (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - Organization And Basis Of Presentation link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - Recent Accounting Developments link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - Receivables - Net link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 10501 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 10601 - Disclosure - Derivatives link:presentationLink link:calculationLink link:definitionLink 10701 - Disclosure - Lam Merger Transaction link:presentationLink link:calculationLink link:definitionLink 10801 - Disclosure - Business Acquisitions link:presentationLink link:calculationLink link:definitionLink 10901 - Disclosure - Goodwill And Other Intangible Assets link:presentationLink link:calculationLink link:definitionLink 11001 - Disclosure - Senior And Subordinated Debt link:presentationLink link:calculationLink link:definitionLink 11101 - Disclosure - Commitments And Contingencies link:presentationLink link:calculationLink link:definitionLink 11201 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 11301 - Disclosure - Incentive Plans link:presentationLink link:calculationLink link:definitionLink 11401 - Disclosure - Employee Benefit Plans link:presentationLink link:calculationLink link:definitionLink 11501 - Disclosure - Restructuring Plans link:presentationLink link:calculationLink link:definitionLink 11601 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 11701 - Disclosure - Net Income Per Share Of Class A Common Stock link:presentationLink link:calculationLink link:definitionLink 11801 - Disclosure - Related Parties link:presentationLink link:calculationLink link:definitionLink 11901 - Disclosure - Regulatory Authorities link:presentationLink link:calculationLink link:definitionLink 12001 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 30403 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 30503 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 30603 - Disclosure - Derivatives (Tables) link:presentationLink link:calculationLink link:definitionLink 30903 - Disclosure - Goodwill And Other Intangible Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 31003 - Disclosure - Senior And Subordinated Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 31103 - Disclosure - Commitments And Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 31203 - Disclosure - Stockholders' Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 31303 - Disclosure - Incentive Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 31403 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 31703 - Disclosure - Net Income Per Share Of Class A Common Stock (Tables) link:presentationLink link:calculationLink link:definitionLink 31803 - Disclosure - Related Parties (Tables) link:presentationLink link:calculationLink link:definitionLink 32003 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 40101 - Disclosure - Organization And Basis Of Presentation (Details) link:presentationLink link:calculationLink link:definitionLink 40301 - Disclosure - Receivables - Net (Details) link:presentationLink link:calculationLink link:definitionLink 40401 - Disclosure - Investments (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40402 - Disclosure - Investments (Company's Investments And Securities Sold, Not Yet Purchased) (Details) link:presentationLink link:calculationLink link:definitionLink 40403 - Disclosure - Investments (Gross Investment Gains And Losses On Investments At Fair Value) (Details) link:presentationLink link:calculationLink link:definitionLink 40404 - Disclosure - Investments (Gross Unrealized Investment Gains And Losses Pertaining To "Trading" Securities) (Details) link:presentationLink link:calculationLink link:definitionLink 40501 - Disclosure - Fair Value Measurements (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40502 - Disclosure - Fair Value Measurements (Categorization Of Investments And Certain Other Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) link:presentationLink link:calculationLink link:definitionLink 40503 - Disclosure - Fair Value Measurements (Summary Of Changes In Fair Value Of The Company's Level 3 Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 40601 - Disclosure - Derivatives (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40602 - Disclosure - Derivatives (Fair Value Of Derivatives Reported On Consolidated Statements Of Financial Condition) (Details) link:presentationLink link:calculationLink link:definitionLink 40603 - Disclosure - Derivatives (Gains (Losses) With Respect To Derivatives Not Designated As Hedging Instruments On The Consolidated Statements Of Operations) (Details) link:presentationLink link:calculationLink link:definitionLink 40701 - Disclosure - Lam Merger Transaction (Details) link:presentationLink link:calculationLink link:definitionLink 40801 - Disclosure - Business Acquisitions (Details) link:presentationLink link:calculationLink link:definitionLink 40901 - Disclosure - Goodwill And Other Intangible Assets (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40903 - Disclosure - Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill) (Details) link:presentationLink link:calculationLink link:definitionLink 41001 - Disclosure - Senior And Subordinated Debt (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 41002 - Disclosure - Senior And Subordinated Debt (Schedule Of Senior Debt) (Details) link:presentationLink link:calculationLink link:definitionLink 41101 - Disclosure - Commitments And Contingencies (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 41201 - Disclosure - Stockholders' Equity (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 41202 - Disclosure - Stockholders' Equity (Schedule Of Group Distributions) (Details) link:presentationLink link:calculationLink link:definitionLink 41203 - Disclosure - Stockholders' Equity (Schedule Of Share Repurchase Program) (Details) link:presentationLink link:calculationLink link:definitionLink 41205 - Disclosure - Stockholders' Equity (Schedule Of Changes In Ownership Interests) (Details) link:presentationLink link:calculationLink link:definitionLink 41206 - Disclosure - Stockholders' Equity (Schedule Of Net Income (Loss) Attributable To Noncontrolling Interests) (Details) link:presentationLink link:calculationLink link:definitionLink 41301 - Disclosure - Incentive Plans (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 41303 - Disclosure - Incentive Plans (Schedule Of Issuance Of RSUs And Charges To Retained Earnings) (Details) link:presentationLink link:calculationLink link:definitionLink 41304 - Disclosure - Incentive Plans (Schedule Of Activity Relating To RSUs And DSUs) (Details) link:presentationLink link:calculationLink link:definitionLink 41401 - Disclosure - Employee Benefit Plans (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 41501 - Disclosure - Restructuring Plans (Details) link:presentationLink link:calculationLink link:definitionLink 41601 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 41701 - Disclosure - Net Income Per Share Of Class A Common Stock (Schedule Of Company's Basic And Diluted Net Income Per Share And Weighted Average Shares Outstanding) (Details) link:presentationLink link:calculationLink link:definitionLink 41801 - Disclosure - Related Parties (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 41802 - Disclosure - Related Parties (Schedule Of Amounts Receivable From And Payable To Related Parties) (Details) link:presentationLink link:calculationLink link:definitionLink 41901 - Disclosure - Regulatory Authorities (Details) link:presentationLink link:calculationLink link:definitionLink 42001 - Disclosure - Segment Information (Schedule Of Segment's Contribution With Respect To Net Revenue, Operating Income (Loss) And Total Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 42002 - Disclosure - Segment Information (Schedule Of Amounts Attributable To Each Of The Company's Business Segments) (Details) link:presentationLink link:calculationLink link:definitionLink