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Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue from services	$ 5,355.6	$ 5,513.9	$ 5,374.4
Cost of services	4,387.2	4,541.7	4,420.3
Gross profit	968.4	972.2	954.1
Selling, general and administrative expenses	883.1	884.8	870.8
Gain on sale of assets	(12.3)	0.0	0.0
Asset impairment charge	15.8	0.0	0.0
Earnings from operations	81.8	87.4	83.3
Gain (loss) on investment in Persol Holdings	35.8	(96.2)	0.0
Other income (expense), net	(1.2)	(0.6)	(1.6)
Earnings (loss) before taxes and equity in net earnings (loss) of affiliate	116.4	(9.4)	81.7
Net earnings before equity in net earnings (loss) of affiliate	116.0	17.7	68.9
Income tax expense (benefit)	0.4	(27.1)	12.8
Equity in net earnings (loss) of affiliate	(3.6)	5.2	2.7
Net earnings	$ 112.4	$ 22.9	$ 71.6
Basic earnings per share	$ 2.85	$ 0.59	$ 1.84
Diluted earnings per share	$ 2.84	$ 0.58	$ 1.81
Average shares outstanding (millions):
Basic (in shares)	39.1	38.8	38.3
Diluted (in shares)	39.2	39.1	39.0

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