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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
--- | --- | --- | ---
Carrying Value |  | $ 2,765.8 |  | $ 2,724.7 |  |
Fixed rate notes payable |  |  |  |  |  |
Carrying Value |  | 2,273.7 |  | 2,273.3 |  |
Estimated Fair Value |  | 2,407.3 |  | 2,358.8 |  |
Floating rate notes payable (1) |  |  |  |  |  |
Carrying Value |  | 492.1 | [1] | 451.4 | [1] | $ 208.8
Estimated Fair Value | [1] | $ 484.0 |  | $ 441.3 |  |
[1] | Includes balances outstanding under our unsecured credit facility 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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