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Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 31, 2018	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 10.0			$ 180.0
Proceeds from Legal Settlements				200.0	$ 0.0	$ 0.0
Gain (Loss) Related to Litigation Settlement			$ 20.3
Letters of Credit Outstanding, Amount			$ 99.5	$ 99.5
Forecast [Member]
Gain Contingencies [Line Items]
Proceeds from Legal Settlements		$ 27.5

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Cash received for the settlement of litigation during the current period.

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