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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, Net | 8. Property, Plant and Equipment, Net The components of net property, plant and equipment were as follows:
|  | December 31 |
(in millions) |  |  | 2023 |  |  |  | 2022 |
Land and improvements |  | $ | 20.9 |  |  | $ | 20.6 |
Buildings and improvements to leaseholds |  |  | 130.7 |  |  |  | 125.3 |
Machinery and equipment |  |  | 442.9 |  |  |  | 439.5 |
Construction in progress |  |  | 5.1 |  |  |  | 3.8 |
|  |  | 599.6 |  |  |  | 589.2 |
Less: accumulated depreciation |  |  | (429.5 | ) |  |  | (404.1 | )
Net property, plant and equipment (1) |  | $ | 170.1 |  |  | $ | 185.1 |
(1) Net property, plant and equipment as of December 31, 2023 and 2022 contained $37.9 million and $52.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $14.1 million, $13.9 million and $12.9 million for the years ended December 31, 2023, 2022, and 2021, respectively.

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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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