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Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - Revenue link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - Allowance for Credit Losses link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - Investments in Affiliates and Related Transactions link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - Property and Equipment link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - Goodwill and Intangibles link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - Accrued Expenses link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 0000019 - 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Disclosure - Goodwill and Intangibles (Tables) link:presentationLink link:calculationLink link:definitionLink 0000039 - Disclosure - Accrued Expenses (Tables) link:presentationLink link:calculationLink link:definitionLink 0000040 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 0000041 - Disclosure - Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 0000042 - Disclosure - Accumulated Other Comprehensive (Loss) / Income (Tables) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - Capital Structure (Tables) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - Stock Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - Restructuring (Tables) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - Earnings per Common Share (Tables) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - Commitments (Tables) link:presentationLink link:calculationLink link:definitionLink 0000049 - Disclosure - Additional Financial Information (Tables) link:presentationLink link:calculationLink link:definitionLink 0000050 - Disclosure - Summary of Significant Accounting Policies - Digital Experience Platform and Activation Solutions Sale (Details) link:presentationLink link:calculationLink link:definitionLink 0000051 - Disclosure - Summary of Significant Accounting Policies - Accounts Receivable Securitization Facility (Details) link:presentationLink link:calculationLink link:definitionLink 0000052 - Disclosure - Summary of Significant Accounting Policies - Software Development Costs (Details) link:presentationLink link:calculationLink link:definitionLink 0000053 - Disclosure - Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) link:presentationLink link:calculationLink link:definitionLink 0000054 - Disclosure - Summary of Significant Accounting Policies - Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 0000055 - Disclosure - Summary of Significant Accounting Policies - Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 0000056 - Disclosure - Summary of Significant Accounting Policies - Foreign Currency (Details) link:presentationLink link:calculationLink link:definitionLink 0000057 - Disclosure - Summary of Significant Accounting Policies - Stock-Based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 0000058 - Disclosure - Summary of Significant Accounting Policies - Geographical Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000059 - Disclosure - Revenue - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 0000060 - Disclosure - Revenue - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000061 - Disclosure - Revenue - Contract Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000062 - Disclosure - Revenue - Remaining Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 0000062 - Disclosure - Revenue - Remaining Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 0000063 - Disclosure - Allowance for Credit Losses - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000064 - Disclosure - Allowance for Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 0000065 - Disclosure - Fair Value Measurements - Hierarchy (Details) link:presentationLink link:calculationLink link:definitionLink 0000066 - Disclosure - Fair Value Measurements - Level 3 Redeemable Noncontrolling Interests (Details) link:presentationLink link:calculationLink link:definitionLink 0000067 - Disclosure - Investments in Affiliates and Related Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 0000068 - Disclosure - Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 0000069 - Disclosure - Goodwill and Intangibles - Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 0000070 - Disclosure - Goodwill and Intangibles - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000071 - Disclosure - Goodwill and Intangibles - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 0000072 - Disclosure - Goodwill and Intangibles - Intangible Assets - Future Amortization (Details) link:presentationLink link:calculationLink link:definitionLink 0000073 - Disclosure - Accrued Expenses (Details) link:presentationLink link:calculationLink link:definitionLink 0000074 - Disclosure - Leases - ROU Assets and Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000075 - Disclosure - Leases - Components of Lease Expense (Details) link:presentationLink link:calculationLink link:definitionLink 0000076 - Disclosure - Leases - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000076 - Disclosure - Leases - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000077 - Disclosure - Leases - Weighted Average Lease Term and Rates (Details) link:presentationLink link:calculationLink link:definitionLink 0000078 - Disclosure - Debt - Offering of Senior Notes (Details) link:presentationLink link:calculationLink link:definitionLink 0000079 - Disclosure - Debt - Carrying Amounts (Details) link:presentationLink link:calculationLink link:definitionLink 0000080 - Disclosure - Debt - Convertible Senior Notes (Details) link:presentationLink link:calculationLink link:definitionLink 0000081 - Disclosure - Debt - 2019 Revolving Credit Facility (Details) link:presentationLink link:calculationLink link:definitionLink 0000082 - Disclosure - Debt - Interest Expense (Details) link:presentationLink link:calculationLink link:definitionLink 0000083 - 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Disclosure - Stock Plans - Restricted Stock and Performance Stock (Details) link:presentationLink link:calculationLink link:definitionLink 0000092 - Disclosure - 401(k) Plan (Details) link:presentationLink link:calculationLink link:definitionLink 0000093 - Disclosure - Restructuring (Details) link:presentationLink link:calculationLink link:definitionLink 0000094 - Disclosure - Income Taxes - Components of Income before Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 0000095 - Disclosure - Income Taxes - Components of Income Tax Expense (Details) link:presentationLink link:calculationLink link:definitionLink 0000096 - Disclosure - Income Taxes - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000097 - Disclosure - Income Taxes - Reconciliation of Statutory Rate (Details) link:presentationLink link:calculationLink link:definitionLink 0000098 - Disclosure - Income Taxes - Deferred Tax Assets (Liabilities) Components (Details) link:presentationLink link:calculationLink link:definitionLink 0000099 - Disclosure - Income Taxes - Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 0000100 - Disclosure - Income Taxes - Unrecognized Tax Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 0000101 - Disclosure - Earnings per Common Share (Details) link:presentationLink link:calculationLink link:definitionLink 0000102 - Disclosure - Commitments (Details) link:presentationLink link:calculationLink link:definitionLink 0000103 - Disclosure - Legal Matters (Details) link:presentationLink link:calculationLink link:definitionLink 0000104 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink 0000105 - Disclosure - Additional Financial Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000106 - Disclosure - SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) link:presentationLink link:calculationLink link:definitionLink