Document and Entity Information [Abstract] Revenue from services Sales Revenue, Services, Net Selling, general and administrative expenses Selling, General and Administrative Expense Earnings (loss) from operations Other Nonoperating Income (Expense) Other Nonoperating Income (Expense), Total Other expense, net Net Income (Loss) Attributable to Parent Net earnings Net earnings (loss) Net earnings (loss) Net earnings (loss) Net earnings (loss) Average shares outstanding (millions): Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted ASSETS Assets [Abstract] Current Assets: Cash and equivalents at end of year Cash and equivalents at beginning of year Cash and Cash Equivalents, at Carrying Value Cash and equivalents Trade accounts receivable, less allowances of $13.4 and $12.3, respectively Accounts Receivable, Net, Current Accounts Receivable, Net, Current, Total Allowance for trade accounts receivable Allowance for trade accounts receivable Property And Equipment: Noncurrent Deferred Taxes Goodwill, net Other Assets Total Assets Assets, Total TOTAL ASSETS LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Stockholders' Equity [Abstract] Current Liabilities: Short-term borrowings and current portion of long-term debt Debt, Current Accrued payroll and related taxes Employee-related Liabilities, Current Noncurrent Liabilities: Stockholders' Equity: Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Statement [Line Items] Common stock, value Common Stock, Value, Issued Common stock, par value Common stock, par value Common stock, shares issued Common stock, shares issued Treasury Stock, Value Treasury stock, value Treasury stock, at cost Class A common stock, 3.4 million shares at 2010 and 5.1 million at 2009 Treasury stock, shares Treasury stock, shares Paid-in capital Additional Paid in Capital, Common Stock Earnings invested in the business Retained Earnings (Accumulated Deficit) Ending balance Beginning balance Total Liabilities and Stockholders' Equity Noncash adjustments: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Provision for bad debts Provision for Doubtful Accounts Stock-based compensation Share-based Compensation Capital expenditures Payments to Acquire Productive Assets Capital expenditures Net cash from financing activities Net Cash Provided by (Used in) Financing Activities Net cash from financing activities Fair Value Measurements Fair Value Disclosures [Text Block] Restructuring Restructuring and Related Activities Disclosure [Text Block] Debt Debt Disclosure [Text Block] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Earnings Per Share Earnings Per Share [Text Block] Other Income and Other Expense Disclosure [Text Block] Other Expense, Net Segment Disclosures Segment Reporting Disclosure [Text Block] Amendment Flag Current Fiscal Year End Date Document Period End Date Document Type Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Voluntary Filers Entity Well-known Seasoned Issuer Entity Public Float Document Fiscal Period Focus Document Fiscal Year Focus Consolidated Statements of Earnings [Abstract] Consolidated Balance Sheets [Abstract] Consolidated Statements of Cash Flows [Abstract] Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Foreign currency translation adjustments, net of tax Unrealized (losses) gains on investments, net of tax Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Comprehensive Income Comprehensive Income, Net of Tax, Attributable to Parent Consolidated Statements of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Fair Value Measurements [Abstract] Restructuring [Abstract] Debt [Abstract] Segment Disclosures [Abstract] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current, Total Prepaid expenses and other current assets Deferred Tax Assets, Net, Current Deferred taxes Assets, Current, Total Total current assets Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated depreciation Accumulated depreciation Property, Plant and Equipment, Net Net property and equipment Taxes Payable, Current Income and other taxes Liabilities, Current, Total Total current liabilities Other Liabilities, Noncurrent Other long-term liabilities Liabilities, Noncurrent, Total Total noncurrent liabilities Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Cost of Services Cost of services Gross Profit Gross profit Asset Impairment Charges Impairment of assets Asset impairments Income Tax Expense (Benefit) Income taxes Increase (Decrease) in Operating Capital Changes in operating assets and liabilities Changes in operating assets and liabilities Net Cash Provided by (Used in) Operating Activities Net cash from operating activities Payments for (Proceeds from) Other Investing Activities Other investing activities Other investing activities Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Property and equipment Accounts Payable and Other Accrued Liabilities, Current Accounts payable and accrued liabilities Workers' Compensation Liability, Current Accrued insurance Workers' Compensation Liability, Noncurrent Accrued insurance Repayments of Debt Repayment of debt Proceeds from (Payments for) Other Financing Activities Sale of stock and other financing activities Legal Matters and Contingencies [Text Block] Contingencies Stock Issued During Period, Value, Other Sale of stock, exercise of stock options, restricted stock awards and other Deferred Compensation Liability, Classified, Noncurrent Accrued retirement benefits Earnings Per Share [Abstract] Earnings per share Operating Income (Loss) Assets, Current [Abstract] Property, Plant and Equipment, Net [Abstract] Deferred Tax Assets, Net, Noncurrent Deferred Tax Assets, Net, Noncurrent, Total Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill, Total Other Assets, Noncurrent Other Assets, Noncurrent, Total Liabilities, Current [Abstract] Liabilities, Noncurrent [Abstract] Stockholders' Equity Attributable to Parent [Abstract] Liabilities and Stockholders' Equity, Total Total Liabilities and Stockholders' Equity Stockholders' Equity Attributable to Parent, Total Total stockholders' equity Total stockholders' equity Cash and Cash Equivalents, Period Increase (Decrease) Net change in cash and equivalents Effect of Exchange Rate on Cash and Cash Equivalents Effect of Exchange Rate on Cash and Cash Equivalents, Total Effect of exchange rates on cash and equivalents Net Cash Provided by (Used in) Investing Activities Net cash from investing activities Proceeds from (Repayments of) Short-term Debt Proceeds from (Repayments of) Short-term Debt, Total Net change in short-term borrowings Other Noncash Income (Expense) Other, net Other Noncash Income (Expense), Total Comprehensive Income, Net of Tax, Attributable to Parent [Abstract] Comprehensive income Common Stock [Member] Common Stock Common Class A [Member] Common Class A Common Class B [Member] Common Class B Treasury Stock [Member] Treasury Stock Paid-in Capital [Member] Paid-in Capital Earnings Invested in the Business [Member] Earnings Invested in the Business Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income Comprehensive Income [Member] Comprehensive Income Earnings (loss) from continuing operations before taxes Payments for (Proceeds from) Derivative Instrument, Investing Activities Settlement of forward exchange contracts Payments for (Proceeds from) Derivative Instrument, Investing Activities, Total Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Diluted earnings (loss) per share: Earnings Per Share, Diluted [Abstract] Earnings Per Share, Basic [Abstract] Basic earnings (loss) per share: Earnings (loss) from continuing operations Income (Loss) from Continuing Operations, Per Basic Share Income (Loss) from Continuing Operations, Per Outstanding Share, Total (Loss) earnings from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share Earnings (loss) from continuing operations Income (Loss) from Continuing Operations, Per Diluted Share (Loss) earnings from discontinued operations Earnings Per Share, Diluted Net earnings Earnings Per Share, Basic Earnings (loss) from continuing operations Income (Loss) from Continuing Operations Attributable to Parent Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: (Loss) earnings from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent, Total Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share Stockholders' Equity [Abstract] Other Expense, Net [Abstract] Commitments and Contingencies [Abstract] New Accounting Pronouncements [Abstract] Description of New Accounting Pronouncements Not yet Adopted [Text Block] New Accounting Pronouncements Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax Reclassification adjustments included in net earnings Reclassification adjustments included in net earnings Payments of Dividends, Common Stock Dividend payments Dividends, Common Stock, Cash Dividends Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of capital stock Long-term Debt, Excluding Current Maturities Long-term Debt Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax Pension liability adjustments, net of tax Deferred Income Tax Expense Benefit Deferred income taxes Payments To Acquire Businesses Net Of Cash Acquired Acquisition of companies, net of cash received Summary of Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Acquisitions [Abstract] Business Combination Disclosure [Text Block] Acquisitions Goodwill [Abstract] Goodwill Disclosure [Text Block] Goodwill Other Assets [Abstract] Other Assets Disclosure [Text Block] Other Assets Stock-Based Compensation [Abstract] Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Stock-Based Compensation Retirement Benefits [Abstract] Compensation and Employee Benefit Plans [Text Block] Retirement Benefits Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Supplemental Cash Flow Information [Abstract] Cash Flow Supplemental Disclosures [Text Block] Supplemental Cash Flow Information Commitments Disclosure [Text Block] Commitments Common Stock, Dividends, Per Share, Cash Paid Dividends per share Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] VALUATION RESERVES Valuation Reserves [Abstract] Selected Quarterly Financial Data [Abstract] Quarterly Financial Information [Text Block] SELECTED QUARTERLY FINANCIAL DATA (unaudited)