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Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | $ 687.3 | $ 652.3 |
Less: Accumulated depreciation and amortization | 338.4 | 309.7 |
Total property and equipment, net | 348.9 | 342.6 |
Depreciation expense | 50.8 | 52.7 | $ 54.5
Computer software costs |  |  |
Computer software costs | 217.9 | 191.7 |
Less: Accumulated amortization | 131.1 | 116.1 |
Computer software costs, net | 86.8 | 75.6 |
Amortization expense related to computer software costs | 17.6 | 18.5 | $ 17.8
Land |  |  |
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | 19.9 | 19.1 |
Buildings and leasehold improvements |  |  |
Property and Equipment |  |  |
Property and equipment before accumulated depreciation and amortization | $ 77.4 | 74.5 |
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 | $ 14.7 | 15.3 |
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 | $ 258.4 | 275.8 |
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 | $ 316.9 | 267.7 |
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 | $ 5.2 | $ 13.7 |

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