Operating Expenses (Tables)
 3 Months Ended
Mar. 31, 2015
Operating Expenses [Abstract]  
Components of Operating Expenses
Operating expenses for the three months ended March 31, 2015 and 2014 were comprised of (in millions):
 
2015
 
2014
Salary and service costs
$
2,620.8

 
$
2,622.8

Office and general expenses
470.7

 
496.7

 
$
3,091.5

 
$
3,119.5


For the three months ended March 31, 2014, we incurred $7.0 million of expenses in connection with the proposed merger with Publicis Groupe S.A.(“Publicis”), which were primarily comprised of professional fees. On May 8, 2014, the proposed merger with Publicis was terminated.