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Investment in PersolKelly Asia Pacific (Details) $ in Millions	Mar. 31, 2019 USD ($) country	Dec. 30, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Investment in equity affiliate	$ 121.2	$ 121.3
Accounts payable and accrued liabilities	$ 517.8	540.6
PersolKelly Asia Pacific
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Number of countries in which entity operates (country) (more than) | country	10
Due from PersolKelly Asia Pacific	$ 12.4	10.2
Advances to PersolKelly Asia Pacific	7.0	7.0
PersolKelly Asia Pacific
Schedule of Equity Method Investments [Line Items]
Accounts payable and accrued liabilities	$ 1.6	$ 0.2

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