Consolidated Statements of Earnings (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Consolidated Statements of Earnings [Abstract]
Revenue from services	$ 1,405.8	$ 1,209.4	$ 2,744.9	$ 2,339.8
Cost of services	1,181.2	1,018.5	2,306.6	1,968.9
Gross profit	224.6	190.9	438.3	370.9
Selling, general and administrative expenses	203.3	180.9	415.4	362.5
Asset impairments		1.5		1.5
Earnings from operations	21.3	8.5	22.9	6.9
Other expense, net	(0.7)	(2.1)	(1.1)	(3.2)
Earnings from continuing operations before taxes	20.6	6.4	21.8	3.7
Income taxes	0.6	2.5	0.7	1.8
Earnings from continuing operations	20.0	3.9	21.1	1.9
Loss from discontinued operations, net of tax	(1.2)		(1.2)
Net earnings	$ 18.8	$ 3.9	$ 19.9	$ 1.9
Basic earnings (loss) per share:
Earnings from continuing operations	$ 0.53	$ 0.11	$ 0.56	$ 0.05
Loss from discontinued operations	$ (0.03)		$ (0.03)
Net earnings	$ 0.50	$ 0.11	$ 0.53	$ 0.05
Diluted earnings (loss) per share:
Earnings from continuing operations	$ 0.53	$ 0.11	$ 0.56	$ 0.05
Loss from discontinued operations	$ (0.03)		$ (0.03)
Net earnings	$ 0.50	$ 0.11	$ 0.53	$ 0.05
Average shares outstanding (millions):
Basic	36.8	36.0	36.7	35.5
Diluted	36.8	36.0	36.7	35.5