Summary Of Significant Accounting Policies Recently Adopted Accounting Pronouncements (Details) $ in Millions	9 Months Ended
Sep. 30, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected losses included in rental expenses	$ 0.4
Cumulative Effect, Period of Adoption, Adjustment \| Accumulated Dividends in Excess of Net Income \| ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact to accumulated dividends in excess of net income	$ 0.5

Amount of increase (decrease) in allowance for credit loss on financing receivable.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration