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v3.20.4

Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | $ 652.3 | $ 654.8 |
Less: Accumulated depreciation and amortization | 309.7 | 293.9 |
Total property and equipment, net | 342.6 | 360.9 |
Depreciation expense | 52.7 | 54.5 | $ 45.6
Computer software costs |  |  |
Computer software costs | 191.7 | 169.9 |
Less: Accumulated amortization | 116.1 | 110.0 |
Computer software costs, net | 75.6 | 59.9 |
Computer software costs | 191.7 | 169.9 |
Amortization expense related to computer software costs | 18.5 | 17.8 | $ 10.9
Land |  |  |
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | 19.1 | 22.3 |
Buildings and leasehold improvements |  |  |
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | $ 74.5 | 84.8 |
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 | $ 15.3 | 16.9 |
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 | $ 275.8 | 261.4 |
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 | $ 267.7 | 269.3 |
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 | $ 13.7 | 22.5 |
Computer software costs | $ 13.7 | $ 22.5 |

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