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Transactions with Affiliates (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity Interests in Real Estate Ventures [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from affiliates | $ 251.3 | $ 195.1 | $ 143.3
Receivables due from affiliates | 20.3 | 32.9 |
Employees [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Receivables due from affiliates | 185.5 | 140.1 |
Employees [Member] | Loans related to co-investments [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Receivables due from affiliates | 16.0 | 13.4 |
Employees [Member] | Travel, relocation and other miscellaneous advances [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Receivables due from affiliates | $ 169.5 | $ 126.7 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 + Details
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