Loans Receivables (Summary Of Information Related To New Consumer Loan Assignments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual net cash flows at the time of assignment	$ 565.1	$ 516.8	$ 1,198.5	$ 1,164.0
Expected net cash flows at the time of assignment	509.5	469.1	1,091.3	1,052.0
Fair value at the time of assignment	362.5	326.9	769.0	736.1
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual net cash flows at the time of assignment	510.1	465.1	1,088.7	1,041.1
Expected net cash flows at the time of assignment	469.6	431.8	1,011.7	963.8
Fair value at the time of assignment	334.1	301.0	712.7	675.4
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual net cash flows at the time of assignment	55.0	51.7	109.8	122.9
Expected net cash flows at the time of assignment	39.9	37.3	79.6	88.2
Fair value at the time of assignment	$ 28.4	$ 25.9	$ 56.3	$ 60.7