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Property, Plant and Equipment, Net | 9 Months Ended
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Sep. 30, 2025
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):
|  | September 30, 2025 |  | December 31, 2024
Equipment, furniture and fixtures, and software |  | $ | 221.2 |  |  | $ | 211.0 |
Building and leasehold improvements |  | 37.1 |  |  | 36.8 |
Land |  | 18.9 |  |  | 18.6 |
Construction in progress |  | 12.9 |  |  | 8.0 |
Plant and transportation equipment |  | 7.1 |  |  | 7.4 |
|  | $ | 297.2 |  |  | $ | 281.8 |
Less: Accumulated depreciation |  | 162.8 |  |  | 148.2 |
Total |  | $ | 134.4 |  |  | $ | 133.6 |
Depreciation expense was $5.7 million and $6.1 million for the three months ended September 30, 2025 and 2024, respectively. These amounts included $3.2 million and $3.7 million of depreciation expense recognized within cost of revenue for the three months ended September 30, 2025 and 2024, respectively. Depreciation expense was $17.1 million and $19.0 million for the nine months ended September 30, 2025 and 2024, respectively. These amounts included $9.7 million and $11.6 million of depreciation expense recognized within cost of revenue for the nine months ended September 30, 2025 and 2024, respectively. As of September 30, 2025 and December 31, 2024, the gross value of capitalized internal-use software included in PP&E was $20.9 million and $20.7 million, respectively, and the net book value as of September 30, 2025 and December 31, 2024, was $7.4 million and $9.8 million, respectively. Assets held-for-sale are included within Other current assets in the Condensed Consolidated Balance Sheets. As of September 30, 2025, there were $6.0 million in assets held-for-sale, which primarily consisted of one building, equipment and land and the associated improvements at the Company's Infrastructure segment. As of December 31, 2024, there were $7.0 million in assets held-for-sale, which primarily consisted of one building, equipment and land and the 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/1943274/2147477798/958-360-50-6 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/1943274/2147477798/958-360-50-1 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/1943274/2147477798/958-360-50-7 + Details
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