Debt (Schedule Of Outstanding Term ABS Financings) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Term ABS 2014-1 [Member]
Debt Instrument [Line Items]
Debt financing close date	Apr. 16, 2014
Net Book Value Of Loans Pledged As Collateral	$ 374.7
Term ABS 2014-2 [Member]
Debt Instrument [Line Items]
Debt financing close date	Sep. 25, 2014
Net Book Value Of Loans Pledged As Collateral	$ 437.6
Term ABS 2015-2 [Member]
Debt Instrument [Line Items]
Debt financing close date	Jan. 29, 2015
Net Book Value Of Loans Pledged As Collateral	$ 375.9
Term ABS 2015-2 [Member]
Debt Instrument [Line Items]
Debt financing close date	Aug. 20, 2015
Net Book Value Of Loans Pledged As Collateral	$ 375.5
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