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Investment in PersolKelly Asia Pacific (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 04, 2016 | Oct. 02, 2016 | Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment in equity affiliate |  |  | $ 121.3 | $ 117.4 |
Equity in net earnings (loss) of affiliate |  |  | 5.2 | 2.7 | $ 1.1
Gain on investment in PersolKelly Asia Pacific |  |  | 0.0 | 0.0 | 87.2
Advances to PersolKelly Asia Pacific |  |  | 7.0 |  |
Accounts payable |  |  | $ 540.6 | 537.7 |
PersolKelly Asia Pacific |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 49.00% |  | 49.00% |  |
Proceeds from investment in PersolKelly Asia Pacific equity affiliate | $ 36.5 |  |  |  |
Investment in equity affiliate | $ 104.2 |  |  |  |
Deconsolidated goodwill |  | $ 1.9 |  |  |
Post-close cash true-up adjustment |  |  |  |  | 4.5
Equity in net earnings (loss) of affiliate |  |  | $ 5.2 | 2.7 | 1.1
Gain on investment in PersolKelly Asia Pacific |  | 87.2 |  |  |
Tax expense on gain on investment in PersolKelly Asia Pacific equity affiliate |  | $ 23.5 |  |  | $ 23.5
Due from PersolKelly Asia Pacific |  |  | 10.2 |  |
Advances to PersolKelly Asia Pacific |  |  | 7.0 |  |
Due to PersolKelly Asia Pacific |  |  |  | 2.3 |
TS Kelly Workforce Solutions |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Repayment of loan |  |  |  | 0.6 |
PersolKelly Asia Pacific |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Accounts payable |  |  | $ 0.2 | $ 2.5 |

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