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Property and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment
6. 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
20212020Useful Lives
Land$19.9 $19.1 Indefinite
Buildings and leasehold improvements77.4 74.5 
3 - 40 years
Office equipment, furniture and fixtures
14.7 15.3 
3 -  7  years
Computer equipment and software costs
258.4 275.8 
3 -  9  years
Machinery, equipment and vehicles (1)
316.9 267.7 
3 - 40 years
Total property, plant, and equipment687.3 652.3 
Less: Accumulated depreciation and amortization (1)
338.4 309.7 
Total property, plant, and equipment, net$348.9 $342.6 
(1)Includes right of use assets associated with finance leases. See Note 15. Leases for additional information.
For 2021, 2020 and 2019, we recorded depreciation expense of $50.8 million, $52.7 million and $54.5 million, respectively.
The amount of computer software costs, including capitalized internally developed software costs and certain hosting arrangement costs, included in property, plant, and equipment are as follows (in millions):
As of December 31,
20212020
Computer software costs$217.9 $191.7 
Less: Accumulated amortization131.1 116.1 
Computer software costs, net$86.8 $75.6 
Included in capitalized computer software costs are costs incurred in connection with software development in progress of $5.2 million and $13.7 million as of December 31, 2021 and 2020, respectively. For 2021, 2020 and 2019, we recorded amortization expense related to computer software costs of $17.6 million, $18.5 million and $17.8 million, respectively.