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Goodwill - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | [2] | $ 1,628.1 | [1] | $ 1,722.2 | [1] |  | $ 1,225.8
Jefferson Wells |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 55.5 |  |  |  |  |
Netherlands | Jefferson Wells |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 55.1 |  | 74.3 |  |  |
United Kingdom | Jefferson Wells |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 100.2 |  | 112.2 |  |  |
Canada |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 41.6 |  | 44.5 |  |  |
Americas | United States |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 1,006.5 |  | 1,013.0 |  | $ 490.2 |
Americas | United States | Jefferson Wells |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 1,085.3 |  | 1,091.7 |  |  |
Northern Europe | Netherlands |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 55.1 |  |  |  |  |
Southern Europe | France |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 79.5 |  | 110.7 |  |  |
Other Reporting Units |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 266.4 |  | $ 288.8 |  |  |
[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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