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Property and Equipment | 12 Months Ended
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Dec. 31, 2015
Property and Equipment |
Property and Equipment | 4. Property and Equipment The amount of property and equipment and their respective estimated useful lives are as follows (in millions, except estimated useful lives):
|  | As of December 31, |  | Estimated
|  | 2015 |  | 2014 |  | Useful Lives
Land |  | $ | 31.6 |  | $ | 17.7 |  | Indefinite
Buildings and leasehold improvements |  |  | 41.2 |  |  | 43.7 |  | 3 - 40 years
Office equipment, furniture and fixtures |  |  | 14.1 |  |  | 13.6 |  | 3 - 10 years
Computer equipment and software costs |  |  | 118.9 |  |  | 102.7 |  | 3 - 10 years
Machinery, equipment and vehicles |  |  | 160.1 |  |  | 132.5 |  | 3 - 40 years
|  |  | 365.9 |  |  | 310.2 |  |
Accumulated depreciation and amortization |  |  | 140.3 |  |  | 106.8 |  |
|  | $ | 225.6 |  | $ | 203.4 |  |
For 2015, 2014 and 2013, we recorded depreciation expense of $35.1 million, $30.3 million and $22.0 million, respectively. The amount of computer software costs, including capitalized internally developed software costs are as follows (in millions):
|  | As of December 31,
|  | 2015 |  | 2014
Computer software costs |  | $ | 91.4 |  | $ | 76.8
Accumulated amortization |  |  | 55.8 |  |  | 45.2
Computer software costs, net |  | $ | 35.6 |  | $ | 31.6
Included in capitalized computer software costs are costs incurred in connection with software development in progress of $7.0 million and $4.7 million as of December 31, 2015 and 2014, respectively. For 2015, 2014 and 2013, we recorded amortization expense related to computer software costs of $10.7 million, $9.8 million and $7.8 million, respectively. The assets and accumulated amortization recorded under capital leases are as follows (in millions):
|  | As of December 31,
|  | 2015 |  | 2014
Capital leases |  | $ | 23.0 |  | $ | 17.7
Accumulated amortization |  |  | 11.0 |  |  | 5.5
Capital leases, net |  | $ | 12.0 |  | $ | 12.2

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: 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 + Details
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