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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment – net consist of the following (in millions):
| December 31,
| 2021 |  | 2020
Property | $ | 53.1 |  |  | $ | 43.6 |
Plant | 284.4 |  |  | 250.1 |
Equipment | 402.4 |  |  | 390.2 |
Leasehold improvements | 50.0 |  |  | 49.9 |
Construction in progress | 26.9 |  |  | 31.1 |
Property, plant and equipment – gross | 816.8 |  |  | 764.9 |
Less: Accumulated depreciation | (387.2) |  |  | (358.3) |
Property, plant and equipment – net | $ | 429.6 |  |  | $ | 406.6 |
Depreciation expense was $44.3 million, $42.3 million and $39.6 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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