Consolidated Statements of Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Income Statement [Abstract]
Revenue from services	$ 1,247.8	$ 1,351.0	$ 3,972.4	$ 4,056.6
Cost of services	1,032.7	1,122.8	3,294.1	3,385.8
Gross profit	215.1	228.2	678.3	670.8
Selling, general and administrative expenses	196.3	211.6	634.9	630.6
Earnings from operations	18.8	16.6	43.4	40.2
Gain on investment in TS Kelly Asia Pacific	87.2	0.0	87.2	0.0
Other expense, net	(0.4)	0.0	(1.4)	(3.5)
Earnings before taxes	105.6	16.6	129.2	36.7
Income tax expense	24.7	7.5	28.2	17.1
Net earnings	$ 80.9	$ 9.1	$ 101.0	$ 19.6
Basic earnings per share (in dollars per share)	$ 2.08	$ 0.23	$ 2.59	$ 0.51
Diluted earnings per share (in dollars per share)	2.06	0.23	2.58	0.51
Dividends per share (in dollars per share)	$ 0.075	$ 0.05	$ 0.20	$ 0.15
Average shares outstanding (millions):
Basic (in shares)	38.1	37.9	38.0	37.8
Diluted (in shares)	38.4	37.9	38.3	37.8