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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
The estimated useful lives of property and equipment are as follows:
Classification
Estimated
Useful Lives
Machinery and equipment
5 to 10 years
Building and leasehold improvements
5 to 25 years
Computer and data processing equipment
3 to 5 years
Computer software
3 to 5 years
Furniture and fixtures
5 to 10 years
Property and equipment consists of the following:
 
 
December 31,
(in millions)
 
2017
 
2016
Building and leasehold improvements
 
$
123.0

 
$
120.4

Computer and data processing equipment
 
116.4

 
101.7

Machinery and equipment
 
45.6

 
43.2

Land
 
27.7

 
27.7

Furnitures and fixtures
 
22.7

 
23.8

Construction in progress
 
17.9

 
20.4

Computer software
 
9.6

 
10.8

Property and equipment, gross
 
362.9

 
348.0

Less: accumulated depreciation
 
(201.8
)
 
(184.3
)
Property and equipment, net
 
$
161.1

 
$
163.7