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Operating Expenses
 6 Months Ended
Jun. 30, 2015
Operating Expenses [Abstract]  
Operating Expenses
Operating Expenses
Operating expenses for the three and six months ended June 30, 2015 and 2014 were (in millions):
 
Three Months
 
Six Months
 
2015
 
2014
 
2015
 
2014
Salary and service costs
$
2,789.7

 
$
2,794.6

 
$
5,410.5

 
$
5,417.4

Office and general expenses
477.0

 
527.9

 
947.7

 
1,024.5

 
$
3,266.7

 
$
3,322.5

 
$
6,358.2

 
$
6,441.9