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Selected Quarterly Financial Data (unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue from services	$ 1,337.8	$ 1,267.7	$ 1,367.5	$ 1,382.6	$ 1,414.7	$ 1,342.4	$ 1,386.9	$ 1,369.9	$ 5,355.6	$ 5,513.9
Gross profit	245.1	227.7	244.0	251.6	254.4	239.1	240.5	238.2	968.4	972.2	$ 954.1
SG&A expenses	216.2	210.6	221.5	234.8	221.3	217.2	220.1	226.2	883.1	884.8	870.8
Restructuring charges included in SG&A expenses	(0.1)	(0.1)	(0.6)	6.3					5.5
(Gain) on sale of assets	0.0	0.0	12.3	0.0					12.3	0.0	0.0
Asset impairment charge	15.8	0.0	0.0	0.0					15.8	0.0	0.0
Gain (loss) on investment in Persol Holdings	0.7	(39.3)	61.2	13.2	(83.2)	15.8	(52.5)	23.7	35.8	(96.2)	0.0
Net earnings (loss)	$ 17.0	$ (10.5)	$ 83.8	$ 22.1	$ (23.9)	$ 33.1	$ (15.4)	$ 29.1	$ 112.4	$ 22.9	$ 71.6
Basic earnings (loss) per share on common stock (in dollars per share)	$ 0.43	$ (0.27)	$ 2.12	$ 0.56	$ (0.62)	$ 0.84	$ (0.40)	$ 0.74	$ 2.85	$ 0.59	$ 1.84
Diluted earnings (loss) per share on common stock (in dollars per share)	0.43	(0.27)	2.12	0.56	(0.62)	0.84	(0.40)	0.74	2.84	0.58	$ 1.81
Dividends per share (in dollars per share)	$ 0.075	$ 0.075	$ 0.075	$ 0.075	$ 0.075	$ 0.075	$ 0.075	$ 0.075	$ 0.30	$ 0.30

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