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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment The following table summarizes the components of property, plant and equipment:
|  |  |  | December 31,
Classification |  | Estimated Useful Life |  | 2020 |  | 2019
Land and buildings |  | 20-35 years |  | $ | 346.5 |  |  | $ | 323.0 |
Machinery and equipment |  | 3-12 years |  | 214.4 |  |  | 198.6 |
Computer equipment, furniture and fixtures |  | 3-7 years |  | 40.8 |  |  | 45.5 |
Right-of-use assets |  |  |  | 44.4 |  |  | 42.3 |
Construction in process |  |  |  | 18.2 |  |  | 21.0 |
Total property, plant and equipment, gross |  |  |  | 664.3 |  |  | 630.4 |
Less: accumulated depreciation |  |  |  | (249.8) |  |  | (232.6) |
Total property, plant and equipment, net |  |  |  | $ | 414.5 |  |  | $ | 397.8 |
Depreciation expense was $38.8, $37.9 and $27.8 for the years ended December 31, 2020, 2019 and 2018, 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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