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Goodwill and Other Intangible Assets - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill	[1]	$ 1,640.4	$ 1,722.2
Jefferson Wells
Goodwill [Line Items]
Goodwill		55.5
Netherlands | Jefferson Wells
Goodwill [Line Items]
Goodwill		96.8
France
Goodwill [Line Items]
Goodwill		67.1	68.2
Canada
Goodwill [Line Items]
Goodwill		40.8	44.5
Americas | United States
Goodwill [Line Items]
Goodwill		1,006.5	1,013.0
Americas | United States | Jefferson Wells
Goodwill [Line Items]
Goodwill		1,085.3	1,091.7
Northern Europe | Netherlands
Goodwill [Line Items]
Goodwill		96.8	112.2
Northern Europe | United Kingdom
Goodwill [Line Items]
Goodwill		93.4	110.7
Southern Europe | France
Goodwill [Line Items]
Goodwill		73.2	74.3
Other Reporting Units
Goodwill [Line Items]
Goodwill		$ 250.9	$ 288.8
[1] Balances were net of accumulated impairment loss of $644.2 as of both September 30, 2022 and December 31, 2021.

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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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