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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 components of property, plant and equipment at December 31 were as follows:
| 2020 |  | 2019
Land | $ | 2.3 |  |  | $ | 2.2 |
Buildings | 87.1 |  |  | 84.7 |
Machinery and other equipment | 223.3 |  |  | 218.1 |
Computer equipment | 117.8 |  |  | 96.4 |
Software | 80.9 |  |  | 73.3 |
| 511.4 |  |  | 474.7 |
Accumulated depreciation | (370.8) |  |  | (334.8) |
| $ | 140.6 |  |  | $ | 139.9 |
Depreciation and amortization expense related to property, plant and equipment was $53.4, $49.2 and $49.5 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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