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Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Amount of property and equipment |  |  |
Property and equipment gross | $ 488.3 | $ 365.9 |
Accumulated depreciation and amortization | 177.1 | 140.3 |
Total property and equipment, net | 311.2 | 225.6 |
Depreciation expense | 42.5 | 35.1 | $ 30.3
Land |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | 27.4 | 31.6 |
Buildings and leasehold improvements |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | $ 87.3 | 41.2 |
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 | $ 15.4 | 14.1 |
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 | 10 years |  |
Computer equipment and software costs |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | $ 140.7 | 118.9 |
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 | 10 years |  |
Machinery, equipment and vehicles |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | $ 217.5 | 160.1 |
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 | $ 94.5 | 91.4 |
Accumulated amortization | 69.5 | 55.8 |
Computer software costs, net | 25.0 | 35.6 |
Computer software costs | 94.5 | 91.4 |
Amortization expense related to computer software costs | 13.7 | 10.7 | $ 9.8
Software development in progress |  |  |
Computer software costs |  |  |
Computer software costs | 12.5 | 7.0 |
Computer software costs | 12.5 | 7.0 |
Capital lease |  |  |
Amount of property and equipment |  |  |
Property and equipment gross | 24.4 | 23.0 |
Accumulated depreciation and amortization | 8.2 | 11.0 |
Total property and equipment, net | $ 16.2 | $ 12.0 |

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