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Segment Disclosures - Segment Earnings from Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Earnings from Operations:
Gross profit	$ 254.4	$ 239.1	$ 240.5	$ 238.2	$ 263.0	$ 230.7	$ 228.8	$ 231.6	$ 972.2	$ 954.1	$ 906.3
SG&A expenses	(221.3)	(217.2)	(220.1)	(226.2)	$ (234.6)	$ (212.5)	$ (208.5)	$ (215.2)	(884.8)	(870.8)	(843.1)
Earnings from operations									87.4	83.3	63.2
Loss on investment in Persol Holdings	$ (83.2)	$ 15.8	$ (52.5)	$ 23.7					(96.2)	0.0	0.0
Gain on investment in PersolKelly Asia Pacific									0.0	0.0	87.2
Other expense, net									(0.6)	(1.6)	(0.7)
Earnings (loss) before taxes and equity in net earnings (loss) of affiliate									(9.4)	81.7	149.7
Reporting Segments | Americas Staffing
Earnings from Operations:
Gross profit									441.3	429.1	398.2
SG&A expenses									(364.2)	(346.4)	(329.4)
Earnings from operations									77.1	82.7	68.8
Reporting Segments | GTS
Earnings from Operations:
Gross profit									381.1	373.7	345.9
SG&A expenses									(296.5)	(296.7)	(287.7)
Earnings from operations									84.6	77.0	58.2
Reporting Segments | International Staffing
Earnings from Operations:
Gross profit									152.3	153.7	166.4
SG&A expenses									(132.3)	(131.6)	(146.9)
Earnings from operations									20.0	22.1	19.5
Less: Intersegment revenue
Earnings from Operations:
Gross profit									(2.5)	(2.4)	(4.2)
SG&A expenses									2.5	2.4	4.2
Earnings from operations									0.0	0.0	0.0
Corporate
Earnings from Operations:
Earnings from operations									$ (94.3)	$ (98.5)	$ (83.3)

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