Consolidated Statements Of Income (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue:
Finance charges	$ 147.5	$ 134.0	$ 290.4	$ 260.1
Premiums earned	12.9	12.0	24.9	22.8
Other income	9.0	5.8	18.8	11.3
Total revenue	169.4	151.8	334.1	294.2
Costs and expenses:
Salaries and wages	23.1	20.4	45.0	39.8
General and administrative	8.3	7.3	16.2	14.7
Sales and marketing	8.5	7.5	17.5	15.3
Provision for credit losses	5.4	2.8	11.2	8.0
Interest	16.2	15.6	32.2	30.8
Provision for claims	10.5	9.0	19.5	17.6
Total costs and expenses	72.0	62.6	141.6	126.2
Income before provision for income taxes	97.4	89.2	192.5	168.0
Provision for income taxes	35.9	32.6	70.4	61.1
Net income	$ 61.5	$ 56.6	$ 122.1	$ 106.9
Net income per share:
Basic	$ 2.57	$ 2.18	$ 5.06	$ 4.11
Diluted	$ 2.56	$ 2.18	$ 5.04	$ 4.10
Weighted average shares outstanding:
Basic	23,974,099	25,925,627	24,151,080	25,993,389
Diluted	24,017,273	25,979,872	24,220,403	26,083,112