Consolidated Statements Of Income (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue:
Finance charges	$ 148.7	$ 137.5	$ 439.1	$ 397.6
Premiums earned	13.1	12.2	38.0	35.0
Other income	10.9	6.0	29.7	17.3
Total revenue	172.7	155.7	506.8	449.9
Costs and expenses:
Salaries and wages	20.1	21.7	65.1	61.5
General and administrative	8.7	6.8	24.9	21.5
Sales and marketing	8.5	8.2	26.0	23.5
Provision for credit losses	6.1	9.8	17.3	17.8
Interest	16.1	16.3	48.3	47.1
Provision for claims	11.0	9.1	30.5	26.7
Total costs and expenses	70.5	71.9	212.1	198.1
Income before provision for income taxes	102.2	83.8	294.7	251.8
Provision for income taxes	37.1	30.9	107.5	92.0
Net income	$ 65.1	$ 52.9	$ 187.2	$ 159.8
Net income per share:
Basic	$ 2.75	$ 2.13	$ 7.80	$ 6.24
Diluted	$ 2.75	$ 2.12	$ 7.78	$ 6.22
Weighted average shares outstanding:
Basic	23,672,635	24,908,247	23,989,845	25,629,034
Diluted	23,708,043	24,962,054	24,047,443	25,706,147