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Property and Equipment | 12 Months Ended
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Dec. 31, 2023
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
|  | 2023 |  | 2022 |  | Useful Lives
Land |  | $ | 81.9 |  |  | $ | 72.8 |  |  | Indefinite
Buildings and leasehold improvements |  | 108.4 |  |  | 103.6 |  |  | 3 - 40 years
Office equipment, furniture and fixtures |  | 14.1 |  |  | 15.7 |  |  | 3 - 7 years
Computer equipment and software costs |  | 329.2 |  |  | 292.2 |  |  | 3 - 9 years
Machinery, equipment and vehicles (1) |  | 433.4 |  |  | 395.4 |  |  | 3 - 40 years
Total property and equipment |  | 966.9 |  |  | 879.6 |  |  |
Less: Accumulated depreciation and amortization (1) |  | 451.6 |  |  | 395.4 |  |  |
Total property and equipment, net |  | $ | 515.3 |  |  | $ | 484.2 |  |  |
(1)Includes right of use assets associated with finance leases. See Note 13. Leases for additional information. For 2023, 2022 and 2021, we recorded depreciation expense of $68.3 million, $64.4 million and $50.8 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,
| 2023 |  | 2022
Computer software costs | $ | 289.2 |  |  | $ | 249.5 |
Less: Accumulated amortization | 175.0 |  |  | 150.2 |
Computer software costs, net | $ | 114.2 |  |  | $ | 99.3 |
Included in capitalized computer software costs are costs incurred in connection with software development in progress of $0.9 million and $5.2 million as of December 31, 2023 and 2022, respectively. For 2023, 2022 and 2021, we recorded amortization expense related to computer software costs of $25.4 million, $21.0 million and $17.6 million, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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