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Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Advisory Services
Goodwill [Line Items]
Transfer of goodwill into (out of) reporting segment	$ (101.4)
Global Workplace Solutions
Goodwill [Line Items]
Transfer of goodwill into (out of) reporting segment	$ 101.4

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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- Details

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