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Investment in PersolKelly Asia Pacific (Details)
$ in Millions
Sep. 29, 2019
USD ($)
country
Jul. 29, 2019
USD ($)
Dec. 30, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]      
Investment in equity affiliate $ 120.4   $ 121.3
Accounts payable and accrued liabilities $ 484.6   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 $ 10.3   10.2
Advances to PersolKelly Asia Pacific   $ 4.4 7.0
Accounts payable and accrued liabilities $ 0.5   $ 0.2