Loans Receivable (Summary Of Changes In Accretable Yield) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 780.3		$ 718.1		$ 628.1
New Consumer Loan assignments	671.0	[1]	615.2	[1]	586.5	[1]
Finance charge income	(630.4)		(590.4)		(538.2)
Forecast changes	35.8		32.5		35.6
Transfers	5.0	[2]	4.9	[2]	6.1	[2]
Balance, end of period	861.7		780.3		718.1
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	667.5		602.9		508.0
New Consumer Loan assignments	593.8	[1]	564.9	[1]	538.7	[1]
Finance charge income	(552.8)		(517.7)		(458.7)
Forecast changes	23.1		24.9		25.6
Transfers	(6.4)	[2]	(7.5)	[2]	(10.7)	[2]
Balance, end of period	725.2		667.5		602.9
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	112.8		115.2		120.1
New Consumer Loan assignments	77.2	[1]	50.3	[1]	47.8	[1]
Finance charge income	(77.6)		(72.7)		(79.5)
Forecast changes	12.7		7.6		10.0
Transfers	11.4	[2]	12.4	[2]	16.8	[2]
Balance, end of period	$ 136.5		$ 112.8		$ 115.2

[1] The Dealer Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related advances paid to Dealers. The Purchased Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Purchase Program, less the related one-time payments made to Dealers.

[2] Under our Portfolio Program, certain events may result in Dealers forfeiting their rights to Dealer Holdback. We transfer the Dealer’s outstanding Dealer Loan balance and related expected future net cash flows to Purchased Loans in the period this forfeiture occurs.