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Acquisitions and Dispositions - Schedule of Preliminary Allocation of Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |
Operating lease right-of-use asset |  | $ 365.7 |  | $ 373.4 |  |  |
Goodwill | [2] | 1,628.1 | [1] | 1,722.2 | [1] |  | $ 1,225.8
Long-term operating lease liability |  | $ (266.6) |  | $ (275.8) |  |  |
Americas |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 14.6 |
Accounts receivable |  |  |  |  |  | 132.6 |
Prepaid expenses and other assets |  |  |  |  |  | 2.6 |
Operating lease right-of-use asset |  |  |  |  |  | 8.7 |
Goodwill |  |  |  |  |  | 513.1 |
Intangible assets subject to amortization, customer relationship |  |  |  |  |  | 360.0 |
Accounts payable |  |  |  |  |  | (21.6) |
Employee compensation payable |  |  |  |  |  | (14.8) |
Accrued liabilities |  |  |  |  |  | (28.7) |
Accrued payroll taxes and insurance |  |  |  |  |  | (6.9) |
Value added taxes payable |  |  |  |  |  | (3.0) |
Long-term operating lease liability |  |  |  |  |  | (5.3) |
Other long-term liabilities |  |  |  |  |  | (20.4) |
Total assets acquired and liabilities assumed |  |  |  |  |  | $ 930.9 |
[1] | Balances were net of accumulated impairment loss of $694.2 and $644.2 as of December 31, 2022 and 2021, respectively.
[2] | Balances were net of accumulated impairment loss of $644.2 ($127.0 related to Northern Europe, $3.8 related to APME, $235.2 related to Right Management and $278.2 related to corporate) as of both January 1, 2021 and December 31, 2021; and $694.2 ($177.0 related to Northern Europe, $3.8 related to APME, $235.2 related to Right Management and $278.2 related to Corporate) as of December 31, 2022.

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