Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
	Mar. 01, 2022	Oct. 01, 2023	Oct. 02, 2022	Apr. 03, 2022	Oct. 01, 2023	Oct. 02, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance					$ 1,254.2
Amounts reclassified from accumulated other comprehensive income (loss)	$ 1.9
Other comprehensive income (loss)		$ (4.3)	$ (6.9)		0.8	$ 7.6
Ending balance		1,235.7	1,252.7		1,235.7	1,252.7
Other income (expense), net		1.6	0.2		3.0	1.9
PersolKelly Pte. Ltd.
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other income (expense), net				$ 1.9
Foreign currency translation adjustments:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(2.3)	(10.5)	(25.0)	(7.4)	(25.0)
Other comprehensive income (loss) before reclassifications		(4.3)	(8.8)		0.8	(17.4)
Other comprehensive income (loss)		(4.3)	(6.9)		0.8	7.6
Ending balance		(6.6)	(17.4)		(6.6)	(17.4)
Foreign currency translation adjustments: | Liquidation of Subsidiary
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)		0.0	0.0		0.0	20.4
Foreign currency translation adjustments: | Equity Method Investment and Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)		0.0	1.9		0.0	4.6
Pension liability adjustments:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(1.1)	(2.7)	(2.7)	(1.1)	(2.7)
Other comprehensive income (loss) before reclassifications		0.0	0.0		0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)		0.0	0.0		0.0	0.0
Other comprehensive income (loss)		0.0	0.0		0.0	0.0
Ending balance		(1.1)	(2.7)		(1.1)	(2.7)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(3.4)	(13.2)	$ (27.7)	(8.5)	(27.7)
Other comprehensive income (loss)		(4.3)	(6.9)		0.8	7.6
Ending balance		$ (7.7)	$ (20.1)		$ (7.7)	$ (20.1)