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Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill	[1]	$ 1,594.1	$ 1,586.8
Jefferson Wells
Goodwill [Roll Forward]
Goodwill		(55.5)	(55.5)
Right Management
Goodwill [Roll Forward]
Goodwill		(62.1)	(62.1)
France
Goodwill [Roll Forward]
Goodwill		76.3	75.6
Americas | United States
Goodwill [Roll Forward]
Goodwill		1,007.2	1,005.8
Southern Europe | Italy
Goodwill [Roll Forward]
Goodwill		$ 3.8	$ 3.8
[1] Balances were net of accumulated impairment loss of $749.3 as of both September 30, 2024 and December 31, 2023.

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- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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