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Investment in PersolKelly Asia Pacific (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Investment in equity affiliate | $ 120.3 | $ 117.4
Accounts payable and accrued liabilities | $ 497.0 | 537.7
PersolKelly Asia Pacific [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 49.00% |
Due from PersolKelly Asia Pacific | $ 2.8 |
Advances to PersolKelly Asia Pacific | 2.9 |
Due to PersolKelly Asia Pacific |  | 2.3
PersolKelly Asia Pacific [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Accounts payable and accrued liabilities | $ 1.6 | $ 2.5

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