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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment
Property and equipment as of December 31, 2014 and 2013 consists of the following (in millions):

 
2014
 
2013
Land
$
28.1

 
$
28.1

Buildings
186.9

 
182.0

Leasehold improvements
111.7

 
97.0

Computer equipment
718.6

 
629.5

Furniture, fixtures, and other equipment
159.1

 
140.8

 
1,204.4

 
1,077.4

Accumulated depreciation and amortization
(721.1
)
 
(638.4
)
 
$
483.3

 
$
439.0