00100 - Statement - Consolidated Condensed Statements of Income
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00200 - Statement - Consolidated Condensed Balance Sheets
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00300 - Statement - Consolidated Condensed Statements of Cash Flows
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40202 - Disclosure - Acquisitions and Dispositions (Estimated Fair Value of Assets Acquired and Liabilities Assumed) (Details)
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40401 - Disclosure - Accounts Receivable and Unbilled Services (Accounts Receivable and Unbilled Services, Net) (Details)
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40501 - Disclosure - Property and Equipment (Property and Equipment, Stated at Cost) (Details)
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40502 - Disclosure - Property and Equipment (Annual Payments to Software Licenses Purchased from a Third-Party Vendor) (Details)
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40901 - Disclosure - Comprehensive Income (Loss) (Comprehensive Income (Loss)) (Details)
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40902 - Disclosure - Comprehensive Income (Loss) (Accumulated Other Comprehensive Loss) (Details)
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41101 - Disclosure - Pension Plan (Components of Pension Costs, U.K. Pension Plan) (Details)
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00090 - Document - Document and Entity Information
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10101 - Disclosure - Significant Accounting Policies
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10201 - Disclosure - Acquisitions and Dispositions
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10301 - Disclosure - Cash and Cash Equivalents, Short-term Investments, Long-term Investments and Other Investments
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10401 - Disclosure - Accounts Receivable and Unbilled Services
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10501 - Disclosure - Property and Equipment
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10601 - Disclosure - Goodwill and Intangible Assets
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10701 - Disclosure - Debt Instruments
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10801 - Disclosure - Shareholders' Equity
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10901 - Disclosure - Comprehensive Income (Loss)
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11001 - Disclosure - Accounting for Derivative Instruments and Hedging Activities
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11101 - Disclosure - Pension Plan
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11201 - Disclosure - Commitments and Contingencies
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11301 - Disclosure - Fair Value of Financial Instruments
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11401 - Disclosure - Business Segment Data
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11501 - Disclosure - Related Party Transactions
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20102 - Disclosure - Significant Accounting Policies (Policy)
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30203 - Disclosure - Acquisitions and Dispositions (Tables)
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30303 - Disclosure - Cash and Cash Equivalents, Short-term Investments, Long-term Investments and Other Investments (Tables)
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30403 - Disclosure - Accounts Receivable and Unbilled Services (Tables)
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30505 - Disclosure - Property and Equipment (Tables)
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30601 - Disclosure - Goodwill and Intangible Assets (Tables)
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30903 - Disclosure - Comprehensive Income (Loss) (Tables)
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31101 - Disclosure - Pension Plan (Tables)
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31301 - Disclosure - Fair Value of Financial Instruments (Tables)
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31401 - Disclosure - Business Segment Data (Tables)
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40101 - Disclosure - Significant Accounting Policies (Details)
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40201 - Disclosure - Acquisitions and Dispositions (Narrative) (Details)
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40203 - Disclosure - Acquisitions and Dispositions (Consolidated Condensed Statements of Income Discontinued Operations) (Details)
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40301 - Disclosure - Cash and Cash Equivalents, Short-term Investments, Long-term Investments and Other Investments (Narrative) (Details)
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40302 - Disclosure - Cash and Cash Equivalents, Short-term Investments, Long-term Investments and Other Investments (Cash and Cash Equivalents, Short-term Investments, Long-term Investments and Other Investments) (Details)
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40303 - Disclosure - Cash and Cash Equivalents, Short-term Investments, Long-term Investments and Other Investments (Gross Realized Gains and Losses on Investments) (Details)
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40304 - Disclosure - Cash and Cash Equivalents, Short-term Investments, Long-term Investments and Other Investments (The Company's Capital Commitments) (Details)
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40601 - Disclosure - Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill) (Details)
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40602 - Disclosure - Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details)
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40603 - Disclosure - Goodwill and Intangible Assets (Schedule of Future Period Amortization Expense) (Details)
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40701 - Disclosure - Debt Instruments (Details)
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40801 - Disclosure - Shareholders' Equity (Details)
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41001 - Disclosure - Accounting for Derivative Instruments and Hedging Activities (Details)
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41201 - Disclosure - Commitments and Contingencies (Details)
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41301 - Disclosure - Fair Value of Financial Instruments (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details)
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41302 - Disclosure - Fair Value of Financial Instruments (Reconciliation of Balances for Assets and Liabilities Measured at Fair Value) (Details)
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41401 - Disclosure - Business Segment Data (Net Revenue and Operating Income (Loss) by Segment) (Details)
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41501 - Disclosure - Related Party Transactions (Details)
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