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Property and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Schedule of property and equipment | The amount of property and equipment and their respective estimated useful lives are as follows (in millions):
|  | As of December 31, |  | Estimated
|  | 2017 |  | 2016 |  | Useful Lives
Land |  | $ | 28.0 |  |  | $ | 27.4 |  |  | Indefinite
Buildings and leasehold improvements |  | 87.2 |  |  | 87.3 |  |  | 3 - 40 years
Office equipment, furniture and fixtures |  | 15.5 |  |  | 15.4 |  |  | 3 - 7 years
Computer equipment and software costs |  | 169.4 |  |  | 140.7 |  |  | 3 - 9 years
Machinery, equipment and vehicles |  | 246.5 |  |  | 217.5 |  |  | 3 - 40 years
|  | 546.6 |  |  | 488.3 |  |  |
Accumulated depreciation and amortization |  | 216.8 |  |  | 177.1 |  |  |
|  | $ | 329.8 |  |  | $ | 311.2 |  |  |
Schedule of amount of computer software costs, including capitalized internally developed software costs | The amount of computer software costs, including capitalized internally developed software costs are as follows (in millions):
| As of December 31,
| 2017 |  | 2016
Computer software costs | $ | 108.0 |  |  | $ | 94.5 |
Accumulated amortization | 80.3 |  |  | 69.5 |
Computer software costs, net | $ | 27.7 |  |  | $ | 25.0 |
Schedule of assets and accumulated amortization recorded under capital leases | The assets and accumulated amortization recorded under capital leases are as follows (in millions):
| As of December 31,
| 2017 |  | 2016
Capital leases | $ | 25.5 |  |  | $ | 24.4 |
Accumulated amortization | 16.0 |  |  | 8.2 |
Capital leases, net | $ | 9.5 |  |  | $ | 16.2 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of long-lived, depreciable assets that are subject to a lease meeting the criteria for capitalization and are used in the normal conduct of business to produce goods and services. Examples may include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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