Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023	Jan. 01, 2023
Income Statement [Abstract]
Revenue from services	$ 4,331.8	$ 4,835.7	$ 4,965.4
Cost of services	3,449.2	3,874.3	3,953.6
Gross profit	882.6	961.4	1,011.8
Selling, general and administrative expenses	818.4	934.7	943.5
Asset impairment charge	13.5	2.4	0.0
Goodwill impairment charge	72.8	0.0	41.0
Gain on sale of EMEA staffing operations	(1.6)	0.0	0.0
Gain on sale of assets	(5.4)	0.0	(6.2)
Loss on disposal	0.0	0.0	18.7
Earnings (loss) from operations	(15.1)	24.3	14.8
Loss on investment in Persol Holdings	0.0	0.0	(67.2)
Loss on currency translation from liquidation of subsidiary	0.0	0.0	(20.4)
Other income (expense), net	(6.8)	0.6	1.6
Earnings (loss) before taxes and equity in net earnings of affiliate	(21.9)	24.9	(71.2)
Income tax benefit	(21.3)	(11.5)	(7.9)
Net earnings (loss) before equity in net earnings of affiliate	(0.6)	36.4	(63.3)
Equity in net earnings of affiliate	0.0	0.0	0.8
Net earnings (loss)	$ (0.6)	$ 36.4	$ (62.5)
Basic earnings (loss) per share (in dollars per share)	$ (0.02)	$ 0.99	$ (1.64)
Diluted earnings (loss) per share (in dollars per share)	$ (0.02)	$ 0.98	$ (1.64)
Average shares outstanding (millions):
Basic (in shares)	35.5	35.9	38.1
Diluted (in shares)	35.5	36.3	38.1