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[Member] Proceeds from company-owned life insurance Proceeds from Life Insurance Policy Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Treasury stock, common stock (in shares) Treasury Stock, Common, Shares Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Related Party Related Party [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Class A Common Stock Capital Stock, Class A common stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Entity Small Business Entity Small Business Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Standby Letter Of Credit Related To Workers Compensation Standby Letter Of Credit Related To Workers Compensation [Member] Termination Date Trading Arrangement Termination Date Indemnification Indemnification Indemnification, Fair Value Disclosure Indemnification, Fair Value Disclosure Subsequent Events [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets Other Assets, Noncurrent Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair 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or Country Code Entity Incorporation, State or Country Code Accrued workers' compensation and other claims Accrued Workers’ Compensation and Other Claims, Current Accrued Workers’ Compensation and Other Claims, Current Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Subsequent Event [Table] Subsequent Event [Table] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Intangible asset, finite-lived, estimated amortization expense, year two Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Disposal Group Name [Axis] Disposal Group Name [Axis] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic earnings per share (in dollars per share) Basic earnings per share on common stock (in dollars per share) Earnings Per Share, Basic Current period provision Accounts Receivable, Current Period Provision Accounts Receivable, Current Period Provision Schedule of Nonvested Performance Shares Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Proceeds from sale of PersolKelly investment Proceeds from (Investment In) Equity Securities, Investing Activities Proceeds from (Investment In) Equity Securities, Investing Activities Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Trade accounts receivable, less allowances of $10.8 and $10.0, respectively Accounts Receivable, after Allowance for Credit Loss, Current Line Of Credit Commitment Fee Threshold [Domain] Line Of Credit Commitment Fee Threshold [Domain] Line Of Credit Commitment Fee Threshold [Domain] Earnings invested in the business Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Restricted cash included in other assets Restricted Cash, Noncurrent Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Gain on sale of EMEA staffing operations Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Currency exchange effects Accounts Receivable, Allowance for Credit Loss, Current Exchange Effects Accounts Receivable, Allowance for Credit Loss, Current Exchange Effects Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover page. Cover [Abstract] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Proceeds from sale of EMEA staffing operations, net of cash disposed Proceeds From Sale Of Productive Assets, Net Of Cash Disposed Proceeds From Sale Of Productive Assets, Net Of Cash Disposed Equity Awards Adjustments Equity Awards Adjustments [Member] Total Liabilities and Stockholders' Equity Liabilities and Equity Business unit profit (loss) Business Unit Profit (Loss) Business Unit Profit (Loss) Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Retirement plan assets Life Insurance, Corporate or Bank Owned, Amount Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Restructuring charges Total Restructuring Charges Tabular List, Table Tabular List [Table Text Block] Paid-in capital Additional Paid in Capital Other income (expense), net Other income (expense), net Other Nonoperating Income (Expense) Intangible asset, finite-lived, estimated amortization expense, year three Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Line Of Credit Commitment Fee Threshold [Axis] Line Of Credit Commitment Fee Threshold [Axis] Line Of Credit Commitment Fee Threshold Noncurrent Assets Assets, Noncurrent [Abstract] Adjustment to Compensation: Adjustment to Compensation [Axis] Dividends Payable [Line Items] Dividends Payable [Line Items] Dividends Payable [Table] Dividends Payable [Table] Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Capital expenditures Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Integration, Realignment and Restructuring Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets at fair value Assets, Fair Value Disclosure Direct salaries Cost, Direct Labor Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Kelly Services, Inc. Kelly Services, Inc. [Member] Kelly Services, Inc. Pay vs Performance Disclosure [Line Items] Hunt Equity Opportunities, LLC Hunt Equity Opportunities, LLC [Member] Hunt Equity Opportunities, LLC Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other, net Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Share-based compensation arrangement by share-based payment award, performance period Share-Based Compensation Arrangement By Share-based Payment Award, Performance Period Share-Based Compensation Arrangement By Share-based Payment Award, Performance Period Goodwill impairment charge Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Cash and equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Treasury Stock, Class B common stock Common Class B Treasury Stock [Member] Common Class B Treasury Stock [Member] Current Assets Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax expense Income Tax Expense (Benefit) Other Income (Expense), Net Other Income and Other Expense Disclosure [Text Block] Adjustments to reconcile net earnings to net cash from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Cost of services Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Net change in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Vesting adjustment (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Adjustment Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Adjustment New Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net earnings (loss) Net earnings (loss) Net earnings (loss) Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Accumulated Other Comprehensive Income by Component, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Interest income Investment Income, Interest Treasury stock, at cost Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]