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Transactions with Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity Interests in Real Estate Ventures [Member]
Related Party Transaction [Line Items]
Revenues from affiliates	$ 723.3	$ 516.4	$ 490.0
Receivables due from affiliates	152.9	102.2
Employees [Member]
Related Party Transaction [Line Items]
Receivables due from affiliates	289.6	250.1
Employees [Member] | Loans related to co-investments [Member]
Related Party Transaction [Line Items]
Receivables due from affiliates	16.9	16.4
Employees [Member] | Travel, relocation and other miscellaneous advances [Member]
Related Party Transaction [Line Items]
Receivables due from affiliates	$ 272.7	$ 233.7

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