Restatement Of Previously Issued Financial Statements (Schedule Of Statement Of Earnings And Comprehensive Income) (Parenthical) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Prior Period Adjustment [Abstract]
(Loss) from disposal of discontinued business, tax (benefit)	$ (5.2)	$ (6.0)	$ (4.1)

Amount of tax expense (benefit) on gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration