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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Carrying Value	[1]	$ 3,170.4	$ 3,166.6
Fixed Rate Notes Payable [Member]
Carrying Value		3,130.5	3,126.9
Estimated Fair Value		3,363.7	3,519.9
Floating Rate Notes Payable [Member]
Carrying Value		39.9	39.7
Estimated Fair Value		$ 40.1	$ 40.0
[1] Unamortized debt discounts and debt issuance costs of $19.6 million and $23.4 million are included in senior unsecured notes payable as of December 31, 2021 and 2020, respectively.

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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=120400017&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
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X

- Definition

Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.19,20,22)
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