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Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | $ 966.9 | $ 879.6 |
Less: Accumulated depreciation and amortization | 451.6 | 395.4 |
Total property and equipment, net | 515.3 | 484.2 |
Depreciation expense | 68.3 | 64.4 | $ 50.8
Computer software costs |  |  |
Computer software costs | 289.2 | 249.5 |
Less: Accumulated amortization | 175.0 | 150.2 |
Computer software costs, net | 114.2 | 99.3 |
Amortization expense related to computer software costs | 25.4 | 21.0 | $ 17.6
Land |  |  |
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | 81.9 | 72.8 |
Buildings and leasehold improvements |  |  |
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | $ 108.4 | 103.6 |
Buildings and leasehold improvements | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 3 years |  |
Buildings and leasehold improvements | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 40 years |  |
Office equipment, furniture and fixtures |  |  |
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | $ 14.1 | 15.7 |
Office equipment, furniture and fixtures | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 3 years |  |
Office equipment, furniture and fixtures | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 7 years |  |
Computer equipment and software costs |  |  |
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | $ 329.2 | 292.2 |
Computer equipment and software costs | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 3 years |  |
Computer equipment and software costs | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 9 years |  |
Machinery, equipment and vehicles |  |  |
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | $ 433.4 | 395.4 |
Machinery, equipment and vehicles | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 3 years |  |
Machinery, equipment and vehicles | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 40 years |  |
Software development in progress |  |  |
Computer software costs |  |  |
Computer software costs | $ 0.9 | $ 5.2 |

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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
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