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Transactions with Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Interests in Real Estate Ventures [Member]
Related Party Transaction [Line Items]
Revenues from affiliates	$ 516.4	$ 490.0	$ 447.8
Receivables due from affiliates	102.2	75.9
Employees [Member]
Related Party Transaction [Line Items]
Receivables due from affiliates	250.1	269.7
Employees [Member] | Loans related to co-investments [Member]
Related Party Transaction [Line Items]
Receivables due from affiliates	16.4	14.1
Employees [Member] | Travel, relocation and other miscellaneous advances [Member]
Related Party Transaction [Line Items]
Receivables due from affiliates	$ 233.7	$ 255.6

X

- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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