Operating Expenses (Tables)

6 Months Ended

Jun. 30, 2013

Operating Expenses [Abstract]

Components of Operating Expenses

Operating expenses for the three and six months ended June 30, 2013 and 2012 were (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Salary and service costs	$	2,598.8	$	2,541.3	$	5,132.3	$	4,975.8
Office and general expenses	515.2		513.3		1,008.8		1,023.5
Operating expenses	$	3,114.0	$	3,054.6	$	6,141.1	$	5,999.3