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Property, Plant, and Equipment, net (Notes) | 6 Months Ended
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Jun. 30, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | 6. Property, Plant, and Equipment, net The following table details the major components of property, plant, and equipment, net:
(in millions) | June 30, 2021 |  | December 31, 2020
Land | $ | 13.2 |  |  | $ | 8.0 |
Buildings and improvements | 118.4 |  |  | 111.9 |
Machinery, equipment, and other | 563.7 |  |  | 562.8 |
Subtotal | 695.3 |  |  | 682.7 |
Less accumulated depreciation | (505.1) |  |  | (491.2) |
Total | $ | 190.2 |  |  | $ | 191.5 |
Depreciation expense totaled $11.8 million and $12.0 million for the three months ended June 30, 2021 and 2020, respectively. For the six months ended June 30, 2021 and 2020, depreciation expense totaled $23.6 million and $24.0 million, 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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