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Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amount of property and equipment |  |  |
Property and equipment gross | $ 546.6 | $ 488.3 |
Accumulated depreciation and amortization | 216.8 | 177.1 |
Total property and equipment, net | 329.8 | 311.2 |
Depreciation expense | 44.1 | 42.5 | $ 35.1
Land |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | 28.0 | 27.4 |
Buildings and leasehold improvements |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | $ 87.2 | 87.3 |
Buildings and leasehold improvements | Minimum |  |  |
Amount of property and equipment |  |  |
Estimated useful lives | 3 years |  |
Buildings and leasehold improvements | Maximum |  |  |
Amount of property and equipment |  |  |
Estimated useful lives | 40 years |  |
Office equipment, furniture and fixtures |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | $ 15.5 | 15.4 |
Office equipment, furniture and fixtures | Minimum |  |  |
Amount of property and equipment |  |  |
Estimated useful lives | 3 years |  |
Office equipment, furniture and fixtures | Maximum |  |  |
Amount of property and equipment |  |  |
Estimated useful lives | 7 years |  |
Computer equipment and software costs |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | $ 169.4 | 140.7 |
Computer equipment and software costs | Minimum |  |  |
Amount of property and equipment |  |  |
Estimated useful lives | 3 years |  |
Computer equipment and software costs | Maximum |  |  |
Amount of property and equipment |  |  |
Estimated useful lives | 9 years |  |
Machinery, equipment and vehicles |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | $ 246.5 | 217.5 |
Machinery, equipment and vehicles | Minimum |  |  |
Amount of property and equipment |  |  |
Estimated useful lives | 3 years |  |
Machinery, equipment and vehicles | Maximum |  |  |
Amount of property and equipment |  |  |
Estimated useful lives | 40 years |  |
Computer software costs |  |  |
Computer software costs |  |  |
Computer software costs | $ 108.0 | 94.5 |
Accumulated amortization | 80.3 | 69.5 |
Computer software costs, net | 27.7 | 25.0 |
Computer software costs | 108.0 | 94.5 |
Amortization expense related to computer software costs | 11.0 | 13.7 | $ 10.7
Software development in progress |  |  |
Computer software costs |  |  |
Computer software costs | 27.6 | 12.5 |
Computer software costs | 27.6 | 12.5 |
Capital lease |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | 25.5 | 24.4 |
Accumulated depreciation and amortization | 16.0 | 8.2 |
Total property and equipment, net | $ 9.5 | $ 16.2 |

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