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Property and Equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment 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
 
 
2018
 
2017
 
Useful Lives
Land
 
$
27.3

 
$
28.0

 
Indefinite
Buildings and leasehold improvements
 
81.0

 
87.2

 
3 - 40 years
Office equipment, furniture and fixtures
 
20.6

 
15.5

 
3 -  7  years
Computer equipment and software costs
 
194.7

 
169.4

 
3 -  9  years
Machinery, equipment and vehicles
 
276.7

 
246.5

 
3 - 40 years
 
 
600.3

 
546.6

 
 
Accumulated depreciation and amortization
 
249.9

 
216.8

 
 
 
 
$
350.3

 
$
329.8

 
 

For 2018, 2017 and 2016, we recorded depreciation expense of $45.6 million, $44.1 million and $42.5 million, respectively.
The amount of computer software costs, including capitalized internally developed software costs are as follows (in millions):
 
As of December 31,
 
2018
 
2017
Computer software costs
$
115.6

 
$
108.0

Accumulated amortization
91.2

 
80.3

Computer software costs, net
$
24.5

 
$
27.7


Included in capitalized computer software costs are costs incurred in connection with software development in progress of $46.2 million and $27.6 million as of December 31, 2018 and 2017, respectively. For 2018, 2017 and 2016, we recorded amortization expense related to computer software costs of $10.9 million, $11.0 million and $13.7 million, respectively.
The assets and accumulated amortization recorded under capital leases are as follows (in millions):
 
As of December 31,
 
2018
 
2017
Capital leases
$
30.9

 
$
25.5

Accumulated amortization
18.4

 
16.0

Capital leases, net
$
12.4

 
$
9.5