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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.

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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