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PROPERTY AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2021
PROPERTY AND EQUIPMENT, NET |
PROPERTY AND EQUIPMENT, NET | 7. PROPERTY AND EQUIPMENT, NET Property and equipment consisted of the following as of December 31, 2021 and 2020 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, | ​ | December 31, |
​ | ​ | 2021 |  | 2020 | ​
Construction in progress | ​ | $ | 17.3 | ​ | $ | 2.0 | ​
Building | ​ | ​ | 68.8 | ​ | ​ | — | ​
Furniture and equipment | ​ |  | 256.5 | ​ |  | 227.1 | ​
Total property and equipment | ​ |  | 342.6 | ​ |  | 229.1 | ​
Less accumulated depreciation | ​ |  | (237.4) | ​ |  | (146.5) | ​
Property and equipment, net | ​ | $ | 105.2 | ​ | $ | 82.6 | ​
​ Depreciation expense using the straight-line method was $33.5 million, $26.8 million and $24.5 million for the years ended December 31, 2021, 2020 and 2019, respectively. As a result of the Merger, there was a reduction in employee workspace needed in Chicago, which led to the decision to market for sale the headquarters location. The Company classified the associated land, building, and certain furniture and equipment of the headquarters location as held for sale, performed an impairment assessment, and ceased depreciation effective May 1, 2019, as the Company anticipated selling the property held for sale in less than twelve months. As of December 31, 2021, the headquarters location remains on the market for sale and management’s intent to sell the property is unchanged. However, due to the time elapsed since active marketing for sale of the building commenced, the Company has reclassified the property to held and used, effective May 1, 2021, and the building was once again subject to depreciation. The total value of the property classified as property held and used was $11.7 million, which includes $2.3 million of land and $9.4 million of property and equipment, net on the consolidated balance sheet as of December 31, 2021. As a result of the headquarters location’s classification as held for sale during the second quarter of 2020, an impairment assessment was performed and an additional impairment charge of $8.1 million was recorded in acquisition related costs within the Options segment in the accompanying consolidated statements of income.

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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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