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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 are stated at cost, less accumulated depreciation. Interest is capitalized as a component of the cost of construction for large projects. Expenditures for betterments are capitalized whereas normal repairs and maintenance are expensed as incurred. Property, other than land, is depreciated on a straight-line basis for financial reporting purposes. When property is sold or retired, the cost of the property and the related accumulated depreciation are removed from the balance sheet, and any gain or loss on the transaction is normally included in cost of products sold. Property, plant and equipment (and related depreciable lives) consisted of the following ($ in millions):
| December 31,
| 2021 |  | 2020
Land and improvements | $ | 31.6 |  |  | $ | 13.6 |
Buildings and improvements (20 to 40 years or remaining life of relevant lease) | 194.5 |  |  | 144.0 |
Machinery and equipment (5 to 20 years) | 739.8 |  |  | 524.4 |
Construction in progress | 32.6 |  |  | 23.1 |
Gross property, plant and equipment | 998.5 |  |  | 705.1 |
Less: Accumulated depreciation | 534.6 |  |  | 366.1 |
Property, plant and equipment, net | $ | 463.9 |  |  | $ | 339.0 |
Depreciation expense was $47.8 million, $42.2 million, and $35.8 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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