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Operating Expenses
 9 Months Ended
Sep. 30, 2015
Operating Expenses [Abstract]  
Operating Expenses
Operating Expenses
Operating expenses for the three and nine months ended September 30, 2015 and 2014 were (in millions):
 
Three Months
 
Nine Months
 
2015
 
2014
 
2015
 
2014
Salary and service costs
$
2,832.6

 
$
2,813.2

 
$
8,243.1

 
$
8,230.7

Office and general expenses
445.7

 
502.8

 
1,393.4

 
1,527.3

 
$
3,278.3

 
$
3,316.0

 
$
9,636.5

 
$
9,758.0