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Property and Equipment | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment (which are carried at cost) as of 2022 and 2021 year end are as follows:
(Amounts in millions) |  | 2022 |  | 2021
Land |  | $ | 32.6 |  |  | $ | 33.8 |
Buildings and improvements |  | 434.7 |  |  | 434.4 |
Machinery, equipment and computer software |  | 1,069.3 |  |  | 1,059.2 |
Property and equipment – gross |  | 1,536.6 |  |  | 1,527.4 |
Accumulated depreciation and amortization |  | (1,024.0) |  |  | (1,009.2) |
Property and equipment – net |  | $ | 512.6 |  |  | $ | 518.2 |
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 $71.5 million, $75.6 million and $73.3 million in 2022, 2021 and 2020, 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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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