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Summary of Significant Accounting Policies - Schedule of Property and Equipment (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Property and Equipment |  |  |
Property and equipment, gross |  | $ 530.2 | $ 624.1
Accumulated depreciation |  | (438.8) | (513.8)
Property and equipment, net | [1],[2] | 91.4 | 110.3
Equipment |  |  |
Property and Equipment |  |  |
Property and equipment, gross |  | 373.4 | 464.6
Leasehold Improvements |  |  |
Property and Equipment |  |  |
Property and equipment, gross |  | 121.6 | 120.1
Furniture and Fixtures |  |  |
Property and Equipment |  |  |
Property and equipment, gross |  | $ 35.2 | 37.5
Projects In Process |  |  |
Property and Equipment |  |  |
Property and equipment, gross |  |  | $ 1.9
[1] | As of December 31, 2022, long-lived assets in International include Assets held for sale of $0.7 million. These assets related to the Company’s Business Solutions business, as further discussed in Note 4.
[2] | As of December 31, 2022, Property and equipment, net included Assets held for sale of $0.7 million, which consisted of property and equipment of the Company’s Business Solutions business, as further described in Note 4.

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