Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Consolidated Statements of Operations (Unaudited) [Abstract]
Revenues from services	$ 5,416.0	[1]	$ 5,188.8	[1]	$ 15,641.7	[1]	$ 14,998.4	[1]
Cost of services	4,510.4		4,335.2		13,022.3		12,518.3
Gross profit	905.6		853.6		2,619.4		2,480.1
Selling and administrative expenses	693.3		691.2		2,092.8		2,135.2
Operating profit	212.3		162.4		526.6		344.9
Interest and other expenses	9.9		5.4		27.0		27.2
Earnings before income taxes	202.4		157.0		499.6		317.7
Provision for income taxes	71.9		62.3		189.2		130.9
Net earnings	$ 130.5		$ 94.7		$ 310.4		$ 186.8
Net earnings per share - basic (in dollars per share)	$ 1.64		$ 1.21		$ 3.89		$ 2.41
Net earnings per share - diluted (in dollars per share)	$ 1.61		$ 1.18		$ 3.82		$ 2.36
Weighted average shares - basic (in shares)	79.7		78.4		79.8		77.6
Weighted average shares - diluted (in shares)	81.1		80.0		81.3		79.2

[1] Our consolidated revenues from services include fees received from our franchise offices of $6.9 and $6.6 for the three months ended September 30, 2014 and 2013, respectively, and $18.8 and $18.0 for the nine months ended September 30, 2014 and 2013, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $302.0 and $285.4 for the three months ended September 30, 2014 and 2013, respectively, and $845.2 and $792.4 for the nine months ended September 30, 2014 and 2013, respectively.