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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, Net | 9. Property, Plant and Equipment, Net The components of net property, plant and equipment were as follows:
| December 31,
(in millions) | 2021 |  | 2020
Land and improvements | $ | 21.5 |  |  | $ | 23.2 |
Buildings and improvements to leaseholds | 140.2 |  |  | 145.9 |
Machinery and equipment | 486.6 |  |  | 480.4 |
Construction in progress | 8.1 |  |  | 8.3 |
| 656.4 |  |  | 657.8 |
Less: accumulated depreciation | (441.8) |  |  | (416.4) |
Property, plant and equipment, net(1) | $ | 214.6 |  |  | $ | 241.4 |
(1)Net property, plant and equipment as of December 31, 2021 and 2020 contained $63.4 million and $65.8 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $12.9 million, $11.4 million and $8.9 million for the years ended December 31, 2021, 2020 and 2019, 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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