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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property and equipment, net consists of the following (in millions):
 
December 31,
 
2018
 
2017
Land
$
11.9

 
$
11.9

Buildings and improvements
71.1

 
65.8

Leasehold improvements
6.7

 
5.4

Computer equipment
208.9

 
203.1

Furniture, fixtures and other equipment
11.0

 
9.3

Property and equipment
309.6

 
295.5

Accumulated depreciation and amortization
(132.5
)
 
(115.6
)
Property and equipment, net
$
177.1

 
$
179.9