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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment The amount of property and equipment and their respective estimated useful lives are as follows (in millions):
 
 
As of December 31,
 
Estimated
 
 
2017
 
2016
 
Useful Lives
Land
 
$
28.0

 
$
27.4

 
Indefinite
Buildings and leasehold improvements
 
87.2

 
87.3

 
3 - 40 years
Office equipment, furniture and fixtures
 
15.5

 
15.4

 
3 -  7  years
Computer equipment and software costs
 
169.4

 
140.7

 
3 -  9  years
Machinery, equipment and vehicles
 
246.5

 
217.5

 
3 - 40 years
 
 
546.6

 
488.3

 
 
Accumulated depreciation and amortization
 
216.8

 
177.1

 
 
 
 
$
329.8

 
$
311.2

 
 
Schedule of amount of computer software costs, including capitalized internally developed software costs The amount of computer software costs, including capitalized internally developed software costs are as follows (in millions):
 
As of December 31,
 
2017
 
2016
Computer software costs
$
108.0

 
$
94.5

Accumulated amortization
80.3

 
69.5

Computer software costs, net
$
27.7

 
$
25.0
Schedule of assets and accumulated amortization recorded under capital leases The assets and accumulated amortization recorded under capital leases are as follows (in millions):
 
As of December 31,
 
2017
 
2016
Capital leases
$
25.5

 
$
24.4

Accumulated amortization
16.0

 
8.2

Capital leases, net
$
9.5

 
$
16.2