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Goodwill - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill		$ 1,722.2	$ 1,225.8		$ 1,260.1
Jefferson Wells
Goodwill [Line Items]
Goodwill		55.5	55.5
United States | Jefferson Wells
Goodwill [Line Items]
Goodwill		1,091.7	545.7
Americas | United States
Goodwill [Line Items]
Goodwill		1,013.0	490.2	$ 490.3
Northern Europe | Netherlands
Goodwill [Line Items]
Goodwill		112.2	119.3
Northern Europe | United Kingdom
Goodwill [Line Items]
Goodwill		110.7	100.2
Northern Europe | Sweden
Goodwill [Line Items]
Goodwill		41.4	43.6
Southern Europe | France
Goodwill [Line Items]
Goodwill		74.3	73.3
Other Reporting Units
Goodwill [Line Items]
Goodwill	[1]	$ 291.9	$ 343.7
[1] (1) As of July 1, 2021, balances pertaining to Right Management were allocated to corresponding reporting units

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.

+ References

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