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Property, Plant and Equipment, Net | 6 Months Ended
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Jun. 30, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, Net | PROPERTY, PLANT AND EQUIPMENT, NET
(in millions) | June 30, 2021 |  | December 31, 2020
Leasehold improvements | $ | 36.5 |  |  | $ | 35.7 |
Equipment | 109.6 |  |  | 117.9 |
Property, plant and equipment, gross | 146.1 |  |  | 153.6 |
Less accumulated depreciation | (102.9) |  |  | (112.9) |
Property, plant and equipment, net | $ | 43.2 |  |  | $ | 40.7 |
| Three months ended June 30, |  | Six months ended June 30,
(in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Depreciation expense | $ | 3.4 |  |  | $ | 2.5 |  |  | $ | 6.3 |  |  | $ | 5.1 |

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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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