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Investment in PersolKelly Pte Ltd. (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2020 USD ($) | Jul. 04, 2021 USD ($) geography | Jun. 28, 2020 USD ($) | Jul. 04, 2021 USD ($) geography | Jun. 28, 2020 USD ($) | Jan. 03, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of geographies in which entity operates | geography |  | 10 |  | 10 |  |
Equity in net earnings (loss) of affiliate |  | $ 1.7 | $ (1.3) | $ 0.6 | $ (2.8) |
Investment in equity affiliate |  | $ 120.0 |  | $ 120.0 |  | $ 118.5
PersolKelly Pte. Ltd. |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 49.00% |  | 49.00% |  |
Due from PersolKelly Pte. Ltd. |  |  |  |  |  | $ 5.6
Proceeds from collection of (payments to fund) long-term loans to related parties |  | $ 5.8 |  |  |  |
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Proceeds from royalties received | $ 0.7 |  |  |  |  |
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited | Joint Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage sold | 100.00% |  |  |  |  |
Proceeds from sale of equity method investments | $ 17.5 |  |  |  |  |

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