| Cover | 12 Months Ended |
| Dec. 31, 2023 | |
| Document Information [Line Items] | |
| Document Type | PRE 14A |
| Amendment Flag | false |
| Entity Information [Line Items] | |
| Entity Registrant Name | Kelly Services, Inc. |
| Entity Central Index Key | 0000055135 |
| Pay vs Performance Disclosure Unit_pure in Millions | 12 Months Ended | |||
| Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | |
| Pay vs Performance Disclosure | ||||
| Pay vs Performance Disclosure, Table | Pay vs. Performance The following table sets forth the compensation for our Chief Executive Officer (“CEO”) and the average compensation for our other non-CEO Non-GAAP Pay vs. Performance Table Year (a) Summary Compensation (1)(2) Average Non-CEO Average Non-CEO (1)(2) Value of Initial Fixed $100 Net (i) CSM:: Non-GAAP (4) TSR TSR Peer (3) (h) 2023 $ 4,163,424 $ 4,313,597 $ 1,407,120 $ 1,555,635 $ 99.65 $ 103.53 $ 121.22 $36.4 $69.1 2022 $ 3,535,281 $ 2,762,629 $ 1,331,744 $ 1,150,597 $ 76.65 $ 81.19 $ 113.87 ($62.5 ) $68.3 2021 $ 3,938,608 $ 2,864,364 $ 1,640,264 $ 1,362,908 $ 74.94 $ 78.78 $ 152.43 $156.1 $52.6 2020 $ 1,550,693 $ 1,334,735 $ 786,788 $ 827,855 $ 91.45 $ 94.29 $ 100.85 ($72.0 ) $44.3 (1) SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine compensation actually paid as reported in the Pay versus Performance Table. Compensation actually paid, generally, is calculated as Summary Compensation Table total compensation adjusted to include the fair market value of equity awards as of the end of the fiscal year for the applicable year or, if earlier, the vesting date (rather than the grant date). We do not offer pension plan benefits therefore, there was not a change in pension value for any of the years reflective in this table. To calculate CAP, the following amounts were deducted from and added to SCT total compensation: CEO and Non-CEO 2023 2022 2021 2020 CEO Non-CEO NEOs CEO Non-CEO CEO Non-CEO CEO Non-CEO Summary Compensation Table Total $4,163,424 $1,407,120 $3,535,281 $1,331,744 $3,938,608 $1,640,264 $1,550,693 $786,788 Summary Compensation Table Stock Awards ($2,160,522 ) ($555,116 ) ($1,811,085 ) ($524,293 ) ($2,734,149 ) ($974,762 ) ($839,987 ) ($326,162 ) FYE value of unvested awards granted during current year $2,236,679 $617,264 $1,052,644 $334,843 $2,045,752 $789,365 $764,875 $405,599 Change in value of unvested awards from prior years $793,531 $239,143 $68,855 $24,517 ($167,781 ) ($41,322 ) ($68,333 ) ($20,316 ) Change in value of awards vesting during current year from the prior years $66,830 $20,763 $98,065 $22,069 $7,513 $2,122 ($73,595 ) ($18,452 ) Prior FYE value for awards not meeting performance requirements ($812,048 ) ($183,487 ) ($191,086 ) ($41,686 ) ($227,577 ) ($53,637 ) — — Dividends accrued on unvested stock awards $25,703 $9,948 $9,957 $3,404 $1,998 $877 $1,082 $399 Compensation Actually Paid $4,313,597 $1,555,635 $2,762,629 $1,150,597 $2,864,364 $1,362,908 $1,334,735 $827,855 (2) Compensation for the non-principal non-CEO (3) As permitted by SEC rules, the peer group referenced for purpose of the TSR comparison is the group of companies included in the S&P 1500 Human Resources and Employment Services Index, which is the industry peer group used for purposes of item 201(e) of Regulation S-K 10-K (4) The following amounts are the reconciliation of the CSM, EFO (in millions): 2023 2022 2021 2020 As Reported $24.3 $14.8 $48.6 ($93.6 ) Gain on sale of assets (6.2 ) (4) (32.1 ) (8) Loss on disposal 18.7 (5) Goodwill impairment charge 41.0 (6) 147.7 (9) Asset impairment charge 2.4 (1) Restructuring charge 35.5 (2) 4.0 (7) 12.8 (10) Transaction costs 6.9 (3) Customer dispute 9.5 (11) Adjusted $69.1 $68.3 $52.6 $44.3 (1) Asset impairment charge in 2023 represents the impairment of right-of-use (2) Restructuring charges in 2023 represents costs related to a comprehensive transformation initiative that includes actions that will further streamline the Company’s operating model to enhance organizational efficiency and effectiveness (3) Transaction costs, which includes employee termination costs, incurred in the fourth quarter of 2023 directly related to the sale of the EMEA staffing operations in the first quarter of 2024 (4) Gain on sale of assets in 2022 is related to the sale of real property in the fourth quarter, under-utilized real property in the second quarter, and other real property sold in the first quarter of 2022 (5) Loss on disposal in 2022 represents the write-off (6) Goodwill impairment charge in 2022 is the result of interim impairment tests the Company performed related to RocketPower due to triggering events caused by changes in market conditions (7) Restructuring charges in 2021 represents severance costs as part of cost management actions designed to increase operational efficiencies with enterprise functions that provide centralize support to operating units (8) Gain on sale of assets primarily represents the excess of proceeds over the cost of the headquarters properties sold during the first quarter of 2020 (9) The goodwill impairment charge is a result of an interim impairment test the Company performed during the first quarter of 2020, due to a triggering event caused by a decline in the Company’s common stock price (10) Restructuring charges in 2020 represents severance and lease terminations in preparation for a new operating model adopted in the third quarter of 2020 (11) Customer dispute in 2020 represents a non-cash | |||
| Company Selected Measure Name | EFO | |||
| Named Executive Officers, Footnote | Compensation for the non-principal non-CEO | |||
| Peer Group Issuers, Footnote | As permitted by SEC rules, the peer group referenced for purpose of the TSR comparison is the group of companies included in the S&P 1500 Human Resources and Employment Services Index, which is the industry peer group used for purposes of item 201(e) of Regulation S-K 10-K | |||
| PEO Total Compensation Amount | $ 4,163,424 | $ 3,535,281 | $ 3,938,608 | $ 1,550,693 |
| PEO Actually Paid Compensation Amount | $ 4,313,597 | 2,762,629 | 2,864,364 | 1,334,735 |
| Adjustment To PEO Compensation, Footnote | CEO and Non-CEO 2023 2022 2021 2020 CEO Non-CEO NEOs CEO Non-CEO CEO Non-CEO CEO Non-CEO Summary Compensation Table Total $4,163,424 $1,407,120 $3,535,281 $1,331,744 $3,938,608 $1,640,264 $1,550,693 $786,788 Summary Compensation Table Stock Awards ($2,160,522 ) ($555,116 ) ($1,811,085 ) ($524,293 ) ($2,734,149 ) ($974,762 ) ($839,987 ) ($326,162 ) FYE value of unvested awards granted during current year $2,236,679 $617,264 $1,052,644 $334,843 $2,045,752 $789,365 $764,875 $405,599 Change in value of unvested awards from prior years $793,531 $239,143 $68,855 $24,517 ($167,781 ) ($41,322 ) ($68,333 ) ($20,316 ) Change in value of awards vesting during current year from the prior years $66,830 $20,763 $98,065 $22,069 $7,513 $2,122 ($73,595 ) ($18,452 ) Prior FYE value for awards not meeting performance requirements ($812,048 ) ($183,487 ) ($191,086 ) ($41,686 ) ($227,577 ) ($53,637 ) — — Dividends accrued on unvested stock awards $25,703 $9,948 $9,957 $3,404 $1,998 $877 $1,082 $399 Compensation Actually Paid $4,313,597 $1,555,635 $2,762,629 $1,150,597 $2,864,364 $1,362,908 $1,334,735 $827,855 | |||
| Non-PEO NEO Average Total Compensation Amount | $ 1,407,120 | 1,331,744 | 1,640,264 | 786,788 |
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 1,555,635 | 1,150,597 | 1,362,908 | 827,855 |
| Adjustment to Non-PEO NEO Compensation Footnote | CEO and Non-CEO 2023 2022 2021 2020 CEO Non-CEO NEOs CEO Non-CEO CEO Non-CEO CEO Non-CEO Summary Compensation Table Total $4,163,424 $1,407,120 $3,535,281 $1,331,744 $3,938,608 $1,640,264 $1,550,693 $786,788 Summary Compensation Table Stock Awards ($2,160,522 ) ($555,116 ) ($1,811,085 ) ($524,293 ) ($2,734,149 ) ($974,762 ) ($839,987 ) ($326,162 ) FYE value of unvested awards granted during current year $2,236,679 $617,264 $1,052,644 $334,843 $2,045,752 $789,365 $764,875 $405,599 Change in value of unvested awards from prior years $793,531 $239,143 $68,855 $24,517 ($167,781 ) ($41,322 ) ($68,333 ) ($20,316 ) Change in value of awards vesting during current year from the prior years $66,830 $20,763 $98,065 $22,069 $7,513 $2,122 ($73,595 ) ($18,452 ) Prior FYE value for awards not meeting performance requirements ($812,048 ) ($183,487 ) ($191,086 ) ($41,686 ) ($227,577 ) ($53,637 ) — — Dividends accrued on unvested stock awards $25,703 $9,948 $9,957 $3,404 $1,998 $877 $1,082 $399 Compensation Actually Paid $4,313,597 $1,555,635 $2,762,629 $1,150,597 $2,864,364 $1,362,908 $1,334,735 $827,855 | |||
| Compensation Actually Paid vs. Total Shareholder Return | ||||
| Compensation Actually Paid vs. Net Income | ||||
| Compensation Actually Paid vs. Company Selected Measure | ||||
| Total Shareholder Return Vs Peer Group | ||||
| Tabular List, Table | As discussed in the CD&A section of this Proxy Statement, the five items listed below represent the most important financial measures we used to determine CAP for FY 2023. Most Important Performance Measures Adjusted EFO Gross Profit EBITDA Margin Revenue Growth Stock Price | |||
| Peer Group Total Shareholder Return Amount | $ 121.22 | 113.87 | 152.43 | 100.85 |
| Net Income (Loss) | $ 36,400,000 | $ (62,500,000) | $ 156,100,000 | $ (72,000,000) |
| Company Selected Measure Amount | 69.1 | 68.3 | 52.6 | 44.3 |
| Measure:: 1 | ||||
| Pay vs Performance Disclosure | ||||
| Name | Adjusted EFO | |||
| Non-GAAP Measure Description | (4) The following amounts are the reconciliation of the CSM, EFO (in millions): 2023 2022 2021 2020 As Reported $24.3 $14.8 $48.6 ($93.6 ) Gain on sale of assets (6.2 ) (4) (32.1 ) (8) Loss on disposal 18.7 (5) Goodwill impairment charge 41.0 (6) 147.7 (9) Asset impairment charge 2.4 (1) Restructuring charge 35.5 (2) 4.0 (7) 12.8 (10) Transaction costs 6.9 (3) Customer dispute 9.5 (11) Adjusted $69.1 $68.3 $52.6 $44.3 (1) Asset impairment charge in 2023 represents the impairment of right-of-use (2) Restructuring charges in 2023 represents costs related to a comprehensive transformation initiative that includes actions that will further streamline the Company’s operating model to enhance organizational efficiency and effectiveness (3) Transaction costs, which includes employee termination costs, incurred in the fourth quarter of 2023 directly related to the sale of the EMEA staffing operations in the first quarter of 2024 (4) Gain on sale of assets in 2022 is related to the sale of real property in the fourth quarter, under-utilized real property in the second quarter, and other real property sold in the first quarter of 2022 (5) Loss on disposal in 2022 represents the write-off (6) Goodwill impairment charge in 2022 is the result of interim impairment tests the Company performed related to RocketPower due to triggering events caused by changes in market conditions (7) Restructuring charges in 2021 represents severance costs as part of cost management actions designed to increase operational efficiencies with enterprise functions that provide centralize support to operating units (8) Gain on sale of assets primarily represents the excess of proceeds over the cost of the headquarters properties sold during the first quarter of 2020 (9) The goodwill impairment charge is a result of an interim impairment test the Company performed during the first quarter of 2020, due to a triggering event caused by a decline in the Company’s common stock price (10) Restructuring charges in 2020 represents severance and lease terminations in preparation for a new operating model adopted in the third quarter of 2020 (11) Customer dispute in 2020 represents a non-cash | |||
| Measure:: 2 | ||||
| Pay vs Performance Disclosure | ||||
| Name | Gross Profit | |||
| Measure:: 3 | ||||
| Pay vs Performance Disclosure | ||||
| Name | EBITDA Margin | |||
| Measure:: 4 | ||||
| Pay vs Performance Disclosure | ||||
| Name | Revenue Growth | |||
| Measure:: 5 | ||||
| Pay vs Performance Disclosure | ||||
| Name | Stock Price | |||
| Class A [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Total Shareholder Return Amount | $ 99.65 | $ 76.65 | $ 74.94 | $ 91.45 |
| Class B [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Total Shareholder Return Amount | 103.53 | 81.19 | 78.78 | 94.29 |
| PEO | Summary Compensation Table Stock Awards [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (2,160,522) | (1,811,085) | (2,734,149) | (839,987) |
| PEO | FYE value of unvested awards granted during current year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 2,236,679 | 1,052,644 | 2,045,752 | 764,875 |
| PEO | Change in value of unvested awards from prior years [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 793,531 | 68,855 | (167,781) | (68,333) |
| PEO | Change in value of awards vesting during current year from the prior years [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 66,830 | 98,065 | 7,513 | (73,595) |
| PEO | Prior FYE value for awards not meeting performance requirements [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (812,048) | (191,086) | (227,577) | 0 |
| PEO | Dividends accrued on unvested stock awards [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 25,703 | 9,957 | 1,998 | 1,082 |
| Non-PEO NEO | Summary Compensation Table Stock Awards [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (555,116) | (524,293) | (974,762) | (326,162) |
| Non-PEO NEO | FYE value of unvested awards granted during current year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 617,264 | 334,843 | 789,365 | 405,599 |
| Non-PEO NEO | Change in value of unvested awards from prior years [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 239,143 | 24,517 | (41,322) | (20,316) |
| Non-PEO NEO | Change in value of awards vesting during current year from the prior years [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 20,763 | 22,069 | 2,122 | (18,452) |
| Non-PEO NEO | Prior FYE value for awards not meeting performance requirements [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (183,487) | (41,686) | (53,637) | 0 |
| Non-PEO NEO | Dividends accrued on unvested stock awards [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | $ 9,948 | $ 3,404 | $ 877 | $ 399 |
