Consolidated Statements Of Income (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue:
Finance charges	$ 590.4	$ 538.2	$ 460.6
Premiums earned	51.5	47.1	40.0
Other income	40.2	23.9	24.6
Total revenue	682.1	609.2	525.2
Costs and expenses:
Salaries and wages	87.3	82.2	63.0
General and administrative	34.4	30.5	25.6
Sales and marketing	34.5	31.2	23.6
Provision for credit losses	21.9	24.0	29.0
Interest	65.0	63.4	57.2
Provision for claims	40.8	34.8	30.4
Total costs and expenses	283.9	266.1	228.8
Income before provision for income taxes	398.2	343.1	296.4
Provision for income taxes	145.1	123.4	108.4
Net income	$ 253.1	$ 219.7	$ 188.0
Net income per share:
Basic	$ 10.61	$ 8.65	$ 7.15
Diluted	$ 10.54	$ 8.58	$ 7.07
Weighted average shares outstanding:
Basic	23,850,789	25,409,655	26,302,289
Diluted	24,009,593	25,598,956	26,600,855