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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, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill	$ 1,233.1	$ 1,260.1
Jefferson Wells
Goodwill [Roll Forward]
Goodwill	55.5
Right Management
Goodwill [Roll Forward]
Goodwill	62.1
Americas | United States
Goodwill [Roll Forward]
Goodwill	490.2	490.3
Americas | United States | Jefferson Wells
Goodwill [Roll Forward]
Goodwill	545.7	545.8
Southern Europe | France
Goodwill [Roll Forward]
Goodwill	66.2	67.3
Southern Europe | Italy
Goodwill [Roll Forward]
Goodwill	$ 4.6	$ 4.6

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

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- Definition

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+ References

No definition available.

+ Details

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