Consolidated Statements Of Operations (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Income Statement [Abstract]
Revenues from services	$ 5,782.3	[1]	$ 4,972.0	[1]	$ 16,522.0	[1]	$ 13,656.9	[1]
Cost of services	4,831.0		4,130.8		13,750.9		11,317.2
Gross profit	951.3		841.2		2,771.1		2,339.7
Selling and administrative expenses	793.3		732.3		2,376.7		2,119.1
Operating profit	158.0		108.9		394.4		220.6
Interest and other expenses	11.0		8.4		33.9		33.2
Earnings before income taxes	147.0		100.5		360.5		187.4
Provision for income taxes	67.4		49.2		172.5		100.6
Net earnings	$ 79.6		$ 51.3		$ 188.0		$ 86.8
Net earnings per share - basic	$ 0.97		$ 0.63		$ 2.30		$ 1.08
Net earnings per share - diluted	$ 0.97		$ 0.62		$ 2.26		$ 1.06
Weighted average shares - basic	81.7		81.9		81.9		80.7
Weighted average shares - diluted	82.4		82.7		83.3		81.7

[1] Our consolidated Revenues from Services include fees received from our franchise offices of $7.2 and $6.8 for the three months ended September 30, 2011 and 2010, respectively, and $18.8 and $17.2 for nine months ending September 30, 2011 and 2010, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $293.9 and $273.3 for the three months ended September 30, 2011 and 2010, respectively and $818.0 and $704.5 for the nine months ended September 30, 2011 and 2010, respectively.