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Property and Equipment | 12 Months Ended
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Jan. 02, 2021
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment (which are carried at cost) as of 2020 and 2019 year end are as follows:
(Amounts in millions) |  | 2020 |  | 2019
Land |  | $ | 34.0 |  |  | $ | 31.9 |
Buildings and improvements |  | 432.0 |  |  | 405.1 |
Machinery, equipment and computer software |  | 1,033.4 |  |  | 988.0 |
Property and equipment – gross |  | 1,499.4 |  |  | 1,425.0 |
Accumulated depreciation and amortization |  | (973.2) |  |  | (903.5) |
Property and equipment – net |  | $ | 526.2 |  |  | $ | 521.5 |
The estimated service lives of property and equipment are principally as follows:
Buildings and improvements |  | 3 to 50 years
Machinery, equipment and computer software |  | 2 to 15 years
Depreciation expense was $73.3 million, $70.1 million and $68.8 million in 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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