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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Carrying value per balance sheet |  |
Fair value of financial assets and liabilities |  |
Notes receivable issued in connection with property sales | $ 18.1 | $ 18.3
Mortgages payable assumed in connection with acquisitions, net | 769.5 | 852.6
Notes and bonds payable, net of unamortized original issuance discounts | 3,786.1 | 3,785.4
Estimated fair value |  |
Fair value of financial assets and liabilities |  |
Notes receivable issued in connection with property sales | 19.9 | 20.1
Mortgages payable assumed in connection with acquisitions, net | 777.6 | 857.9
Notes and bonds payable, net of unamortized original issuance discounts | $ 3,988.6 | $ 4,092.8

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents mortgages payable as of the balance sheet date. + References No definition available. + Details
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- Definition The fair value disclosure of notes receivable issued in connection with property sales. + References No definition available. + Details
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- 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 Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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