Loans Receivable (Summary Of Changes In Accretable Yield) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 766.1		$ 701.2		$ 718.1		$ 628.1
New Consumer Loan assignments	151.8	[1]	138.5	[1]	474.1	[1]	454.4	[1]
Finance charge income	(148.7)		(137.5)		(439.1)		(397.6)
Forecast changes	9.0		8.1		23.0		22.7
Transfers	1.5	[2]	1.7	[2]	3.6	[2]	4.4	[2]
Balance, end of period	779.7		712.0		779.7		712.0
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	654.8		581.7		602.9		508.0
New Consumer Loan assignments	138.1	[1]	127.7	[1]	437.1	[1]	416.2	[1]
Finance charge income	(131.0)		(117.8)		(384.5)		(337.3)
Forecast changes	7.6		6.8		17.7		16.3
Transfers	(1.9)	[2]	(2.5)	[2]	(5.6)	[2]	(7.3)	[2]
Balance, end of period	667.6		595.9		667.6		595.9
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	111.3		119.5		115.2		120.1
New Consumer Loan assignments	13.7	[1]	10.8	[1]	37.0	[1]	38.2	[1]
Finance charge income	(17.7)		(19.7)		(54.6)		(60.3)
Forecast changes	1.4		1.3		5.3		6.4
Transfers	3.4	[2]	4.2	[2]	9.2	[2]	11.7	[2]
Balance, end of period	$ 112.1		$ 116.1		$ 112.1		$ 116.1

[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.