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Property and Equipment
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment
8. 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
20222021Useful Lives
Land$72.8 $19.9 Indefinite
Buildings and leasehold improvements103.6 77.4 
3 - 40 years
Office equipment, furniture and fixtures
15.7 14.7 
3 - 7 years
Computer equipment and software costs
292.2 258.4 
3 - 9 years
Machinery, equipment and vehicles (1)
395.4 316.9 
3 - 40 years
Total property and equipment
879.6 687.3 
Less: Accumulated depreciation and amortization (1)
395.4 338.4 
Total property and equipment, net
$484.2 $348.9 
(1)Includes right of use assets associated with finance leases. See Note 13. Leases for additional information.
For 2022, 2021 and 2020, we recorded depreciation expense of $64.4 million, $50.8 million and $52.7 million, respectively.
The amount of computer software costs, including capitalized internally developed software costs and certain hosting arrangement costs, included in property and equipment are as follows (in millions):
As of December 31,
20222021
Computer software costs$249.5 $217.9 
Less: Accumulated amortization150.2 131.1 
Computer software costs, net$99.3 $86.8 
Included in capitalized computer software costs are costs incurred in connection with software development in progress of $5.2 million and $5.2 million as of December 31, 2022 and 2021, respectively. For 2022, 2021 and 2020, we recorded amortization expense related to computer software costs of $21.0 million, $17.6 million and $18.5 million, respectively.