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Operating Expenses
 9 Months Ended
Sep. 30, 2013
Operating Expenses [Abstract]  
Operating Expenses
Operating Expenses
Operating expenses for the three and nine months ended September 30, 2013 and 2012 were (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Salary and service costs
$
2,579.2

 
$
2,515.8

 
$
7,711.5

 
$
7,491.5

Office and general expenses
503.8

 
503.5

 
1,512.6

 
1,527.1

Merger expenses
28.1

 
—

 
28.1

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating expenses
$
3,111.1

 
$
3,019.3

 
$
9,252.2

 
$
9,018.6

 
 
 
 
 
 
 
 
In the third quarter of 2013 we incurred $28.1 million of expenses in connection with the pending merger with Publicis, which were primarily comprised of professional fees. The merger expenses are shown as a separate component of operating expenses. We expect to incur significant additional merger expenses.