Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Significant Accounting Policies [Abstract]

Components of Operating Expenses

Operating expenses for the three years ended December 31, 2012 were (in millions):

	2012		2011		2010
Salary and service costs	$	10,380.7	$	10,250.6	$	9,214.2
Office and general expenses	2,034.5		1,950.8		1,868.1
Operating expenses	$	12,415.2	$	12,201.4	$	11,082.3