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Goodwill - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | [2] | $ 1,586.8 | [1] | $ 1,628.1 | [1] |  | $ 1,722.2
Jefferson Wells |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 55.5 |  |  |  |  |
Netherlands | Jefferson Wells |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 0.0 |  | 55.1 |  |  |
United Kingdom | Jefferson Wells |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 105.7 |  | 100.2 |  |  |
Canada |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 42.6 |  | 41.6 |  |  |
Americas | United States |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 1,006.5 |  | 1,006.5 |  | $ 1,013.0 |
Americas | United States | Jefferson Wells |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 1,085.3 |  | 1,085.3 |  |  |
Southern Europe | France |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 81.7 |  | 79.5 |  |  |
Other Reporting Units |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 271.5 |  | $ 266.4 |  |  |
[1] | Balances were net of accumulated impairment loss of $749.3 and $694.2 as of December 31, 2023 and 2022, respectively.
[2] | Balances were net of accumulated impairment loss of $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; and $749.3 ($232.1 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, 2023.

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