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Fair Value Measurements (Fair Value Of Notes Receivable And Notes Payable) (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
--- | --- | --- | ---
Carrying Value |  | $ 2,674.7 |  | $ 2,743.5 |  |
Fixed rate notes payable |  |  |  |  |  |
Carrying Value |  | 2,283.8 |  | 2,533.8 |  |
Estimated Fair Value |  | 2,367.1 |  | 2,666.1 |  |
Floating rate notes payable (1) |  |  |  |  |  |
Carrying Value |  | 390.9 | [1] | 209.7 | [1] | $ 390.5
Estimated Fair Value | [1] | $ 383.5 |  | $ 203.7 |  |
[1] | Includes balances outstanding under our unsecured line of credit and unsecured short term borrowings.

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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 4: 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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