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Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Goodwill [Roll Forward] |  |  |
Goodwill | [1] | $ 1,631.7 | $ 1,628.1
Jefferson Wells |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill |  | 55.5 |
Right Management |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill |  | 62.1 |
France |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill |  | 74.3 | 73.3
Americas | United States |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill |  | 1,006.5 | 1,006.5
Americas | United States | Jefferson Wells |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill |  | 1,085.3 | 1,085.3
Southern Europe | France |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill |  | 80.4 | 79.5
Southern Europe | Italy |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill |  | $ 3.7 | $ 3.7
[1] | Balances were net of accumulated impairment loss of $694.2 as of both March 31, 2023 and December 31, 2022.

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