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Property, Plant and Equipment, Net | 3 Months Ended
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Mar. 31, 2024
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, Net | 7. Property, Plant and Equipment, Net Property, plant and equipment, net, ("PP&E") consisted of the following (in millions):
|  | March 31, 2024 |  | December 31, 2023
Equipment, furniture and fixtures, and software |  | $ | 208.2 |  |  | $ | 210.7 |
Building and leasehold improvements |  | 40.8 |  |  | 42.9 |
Land |  | 24.6 |  |  | 25.8 |
Construction in progress |  | 7.1 |  |  | 4.8 |
Plant and transportation equipment |  | 8.0 |  |  | 8.1 |
|  | $ | 288.7 |  |  | $ | 292.3 |
Less: Accumulated depreciation |  | 141.9 |  |  | 137.7 |
Total |  | $ | 146.8 |  |  | $ | 154.6 |
Depreciation expense was $6.5 million and $6.3 million for the three months ended March 31, 2024 and 2023, respectively. These amounts included $4.0 million and $3.9 million of depreciation expense recognized within cost of revenue for the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024 and December 31, 2023, the net book value of equipment under finance leases included in PP&E was $0.9 million and $2.3 million, respectively. As of March 31, 2024 and December 31, 2023, $3.8 million and $3.1 million in assets held-for-sale were presented separately in the Consolidated Balance Sheet. As of March 31, 2024 assets held-for-sale primarily consisted of a building and land and their associated improvements at the Company's Infrastructure segment. As of December 31, 2023, assets held-for-sale primarily consisted of two buildings and their associated building improvements at the Company's Infrastructure segment.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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