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PROPERTY AND EQUIPMENT, NET - Headquarters location (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Property and Equipment, Net |  |  |
Property held and used |  | $ 105.2 | $ 82.6
Land |  | 2.3 |
Property and equipment |  | 105.2 | $ 82.6
Chicago Headquarters Location |  |  |
Property and Equipment, Net |  |  |
Property held and used |  | 11.7 |
Land |  | 2.3 |
Property and equipment |  | $ 9.4 |
Chicago Headquarters Location | Options |  |  |
Property and Equipment, Net |  |  |
Impairment charge | $ 8.1 |  |

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