Debt (Schedule Of Outstanding Term ABS Financings) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Term ABS 2016-1 [Member]
Debt Instrument [Line Items]
Debt financing close date	Feb. 26, 2016
Net Book Value Of Loans Pledged As Collateral	$ 481.4
Term ABS 2016-2 [Member]
Debt Instrument [Line Items]
Debt financing close date	May 12, 2016
Net Book Value Of Loans Pledged As Collateral	$ 437.8
Term ABS 2016-3 [Member]
Debt Instrument [Line Items]
Debt financing close date	Oct. 27, 2016
Net Book Value Of Loans Pledged As Collateral	$ 437.8
Term ABS 2017-1 [Member]
Debt Instrument [Line Items]
Debt financing close date	Feb. 23, 2017
Net Book Value Of Loans Pledged As Collateral	$ 437.8
Term ABS 2017-2 [Member]
Debt Instrument [Line Items]
Debt financing close date	Jun. 29, 2017
Net Book Value Of Loans Pledged As Collateral	$ 563.2
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