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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Carrying Value	[1]	$ 3,168.5	$ 3,166.6
Fixed rate notes payable
Carrying Value		3,128.7	3,126.9
Estimated Fair Value		3,335.3	3,519.9
Floating rate notes payable (1)
Carrying Value		39.8	39.7	$ 99.8
Estimated Fair Value		$ 40.1	$ 40.0
[1] Unamortized debt discounts and debt issuance costs of $21.5 million and $23.4 million are included in senior unsecured notes payable as of June 30, 2021 and December 31, 2020, respectively.

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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

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-SubTopic 210
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- Definition

Fair value portion of notes payable.

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