Debt (Schedule Of Outstanding Term ABS Financings) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Term ABS 2016-1 [Member]
Debt Instrument [Line Items]
Debt financing close date	Feb. 20, 2020
Net Book Value Of Loans Pledged As Collateral	$ 625.1
Term ABS 2016-2 [Member]
Debt Instrument [Line Items]
Debt financing close date	Jul. 23, 2020
Net Book Value Of Loans Pledged As Collateral	$ 602.3
Term ABS 2017-3 [Member]
Debt Instrument [Line Items]
Debt financing close date	Oct. 26, 2017
Net Book Value Of Loans Pledged As Collateral	$ 437.6
Term ABS 2018-1 [Member]
Debt Instrument [Line Items]
Debt financing close date	Feb. 22, 2018
Net Book Value Of Loans Pledged As Collateral	$ 625.1
Term ABS 2018-2 [Member]
Debt Instrument [Line Items]
Debt financing close date	May 24, 2018
Net Book Value Of Loans Pledged As Collateral	$ 562.6
Term ABS 2018-3 [Member]
Debt Instrument [Line Items]
Debt financing close date	Aug. 23, 2018
Net Book Value Of Loans Pledged As Collateral	$ 500.1
Term ABS 2019-1 [Member]
Debt Instrument [Line Items]
Debt financing close date	Feb. 21, 2019
Net Book Value Of Loans Pledged As Collateral	$ 503.1
Term ABS 2019-2 [Member]
Debt Instrument [Line Items]
Debt financing close date	Aug. 28, 2019
Net Book Value Of Loans Pledged As Collateral	$ 625.1
Term ABS 2019-3 [Member]
Debt Instrument [Line Items]
Debt financing close date	Nov. 21, 2019
Net Book Value Of Loans Pledged As Collateral	$ 439.6
TermAssetBackedSecuredFinancingsTwoThousandTwentyThree
Debt Instrument [Line Items]
Debt financing close date	Oct. 22, 2020
Net Book Value Of Loans Pledged As Collateral	$ 750.1