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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, gross |  | $ 406.8 | $ 577.7 | $ 406.8 |
Accumulated depreciation and amortization |  | (85.5) | (105.5) | (85.5) |
Property and equipment, net |  | 321.3 | 472.2 | 321.3 |
Depreciation expense for property and equipment |  |  | 33.8 | 29.1 | $ 29.0
Depreciated assets written-off |  |  | 14.1 | 27.6 |
Proceeds from sale of property and equipment and other assets |  |  | 0.0 | 30.1 | $ 0.6
Leasehold improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, gross |  | 108.9 | 87.8 | 108.9 |
Furniture, office equipment and vehicles |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, gross |  | 52.6 | 73.4 | 52.6 |
Computer hardware and software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, gross |  | 43.8 | 56.3 | 43.8 |
Aircrafts |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, gross |  | 44.2 | 44.2 | 44.2 |
Proceeds from sale of property and equipment and other assets | $ 24.9 |  |  |  |
Gain (loss) on disposition of assets |  | 3.3 |  |  |
Land |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, gross |  | 52.2 | 52.2 | 52.2 |
Buildings |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, gross |  | $ 105.1 | $ 263.8 | $ 105.1 |

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