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Goodwill - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions	Dec. 31, 2019	Apr. 03, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 1,260.1		$ 1,297.1		$ 1,343.0
Americas | United States
Goodwill [Line Items]
Goodwill	490.3		476.5	$ 476.5
Americas | United States | Jefferson Wells
Goodwill [Line Items]
Goodwill	545.8		532.0
Northern Europe | Germany
Goodwill [Line Items]
Goodwill	67.2		129.2
Northern Europe | Netherlands
Goodwill [Line Items]
Goodwill	109.5		112.0
Northern Europe | United Kingdom
Goodwill [Line Items]
Goodwill	97.3		93.7
Southern Europe
Goodwill [Line Items]
Goodwill		$ 33.8
Southern Europe | France
Goodwill [Line Items]
Goodwill	67.3		68.9	$ 76.3
Other Reporting Units
Goodwill [Line Items]
Goodwill	310.9		299.2
Reportable segments | Americas
Goodwill [Line Items]
Goodwill	535.6		519.9		519.2
Reportable segments | Northern Europe
Goodwill [Line Items]
Goodwill	374.6		435.4		468.1
Reportable segments | Southern Europe
Goodwill [Line Items]
Goodwill	144.8		112.2		121.9
Reportable segments | Right Management
Goodwill [Line Items]
Goodwill	$ 62.1		$ 62.1		$ 62.1

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
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-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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