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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. 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
Quarterly Financial Information Disclosure [Abstract]
Revenue from services	$ 1,414.7	$ 1,342.4	$ 1,386.9	$ 1,369.9	$ 1,422.3	$ 1,328.8	$ 1,333.6	$ 1,289.7	$ 5,513.9	$ 5,374.4
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
Restructuring charges included in SG&A expenses					0.0	0.0	0.0	2.4		2.4
Gain (loss) on investment in Persol Holdings	(83.2)	15.8	(52.5)	23.7					(96.2)	0.0	0.0
Net earnings (loss)	$ (23.9)	$ 33.1	$ (15.4)	$ 29.1	$ 17.7	$ 23.0	$ 18.7	$ 12.2	$ 22.9	$ 71.6	$ 120.8
Basic earnings (loss) per share on common stock (in dollars per share)	$ (0.62)	$ 0.84	$ (0.40)	$ 0.74	$ 0.46	$ 0.59	$ 0.48	$ 0.31	$ 0.59	$ 1.84	$ 3.10
Diluted earnings (loss) per share on common stock (in dollars per share)	(0.62)	0.84	(0.40)	0.74	0.45	0.58	0.47	0.31	0.58	1.81	3.08
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	$ 0.275
Quantifying misstatement in current year financial statements amount						$ 2.8				$ 1.4

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