Loans Receivable (Summary Of Changes In Accretable Yield) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 718.1		$ 628.1
New Consumer Loan assignments	175.3	[1]	173.8	[1]
Finance charge income	(142.9)		(126.1)
Forecast changes	2.8		4.2
Transfers	1.1	[2]	1.5	[2]
Balance, end of period	754.4		681.5
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	602.9		508.0
New Consumer Loan assignments	163.6	[1]	157.7	[1]
Finance charge income	(124.1)		(105.7)
Forecast changes	(0.2)		3.5
Transfers	(2.2)	[2]	(2.4)	[2]
Balance, end of period	640.0		561.1
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	115.2		120.1
New Consumer Loan assignments	11.7	[1]	16.1	[1]
Finance charge income	(18.8)		(20.4)
Forecast changes	3.0		0.7
Transfers	3.3	[2]	3.9	[2]
Balance, end of period	$ 114.4		$ 120.4

[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 to Purchased Loans in the period this forfeiture occurs.