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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Current Fiscal Year End Date		--12-31
Carrying Value	[1]	$ 3,166.6	$ 2,524.1
Fixed Rate Notes Payable [Member]
Carrying Value		3,126.9	2,380.4
Estimated Fair Value		3,519.9	2,533.5
Floating Rate Notes Payable [Member]
Carrying Value		39.7	143.7
Estimated Fair Value		$ 40.0	$ 143.8
[1] Unamortized debt discounts and debt issuance costs of $23.4 million and $19.9 million are included in senior unsecured notes payable as of December 31, 2020 and 2019, respectively.

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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.

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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Fair value portion of notes payable.

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