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PROPERTY, PLANT & EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT & EQUIPMENT | PROPERTY, PLANT & EQUIPMENT The major classes of depreciable assets are as follows:
|  | December 31,
In millions |  | 2020 |  | 2019
Machinery and equipment |  | $ | 1,474.6 |  |  | $ | 1,363.8 |
Buildings and improvements |  | 801.1 |  |  | 774.2 |
Land and improvements |  | 97.6 |  |  | 78.0 |
Property, plant and equipment |  | 2,373.3 |  |  | 2,216.0 |
Less: accumulated depreciation |  | (771.7) |  |  | (560.2) |
Total |  | $ | 1,601.6 |  |  | $ | 1,655.8 |
The estimated useful lives of property, plant and equipment are as follows:
|  | Years
Land improvements |  | 10 to 20
Building and improvements |  | 20 to 40
Machinery and equipment |  | 3 to 15
Depreciation expense was $183.1 million, $157.8 million, and $66.4 million for 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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