Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Consolidated Statements of Operations (Unaudited) [Abstract]
Revenues from services	$ 5,321.7	[1]	$ 5,040.7	[1]	$ 10,225.7	[1]	$ 9,809.6	[1]
Cost of services	4,424.4		4,204.3		8,511.9		8,183.1
Gross profit	897.3		836.4		1,713.8		1,626.5
Selling and administrative expenses	709.9		708.3		1,399.5		1,444.0
Operating profit	187.4		128.1		314.3		182.5
Interest and other expenses	7.9		10.3		17.1		21.8
Earnings before income taxes	179.5		117.8		297.2		160.7
Provision for income taxes	69.7		49.6		117.3		68.6
Net earnings	$ 109.8		$ 68.2		$ 179.9		$ 92.1
Net earnings per share - basic (in dollars per share)	$ 1.37		$ 0.88		$ 2.25		$ 1.19
Net earnings per share - diluted (in dollars per share)	$ 1.35		$ 0.87		$ 2.21		$ 1.17
Weighted average shares - basic (in shares)	79.9		77.4		79.9		77.3
Weighted average shares - diluted (in shares)	81.4		78.6		81.4		78.6

[1] Our consolidated revenues from services include fees received from our franchise offices of $6.4 and $6.1 for the three months ended June 30, 2014 and 2013, and $11.9 and $11.4 for the six months ended June 30, 2014 and 2013, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $286.6 and $272.3 for the three months ended June 30, 2014 and 2013, respectively, and $543.2 and $507.0 for the six months ended June 30, 2014 and 2013, respectively.