Consolidated Statements Of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues [Abstract]
Finance Charges Revenue	$ 1,686.3	$ 1,742.6	$ 1,562.4
Premiums earned	62.7	60.3	57.3
Other Income	83.4	53.1	49.6
Total revenue	1,832.4	1,856.0	1,669.3
Costs and expenses [Abstract]
Salaries and wages	262.0	218.1	186.5
General and administrative	88.7	100.3	69.6
Sales and marketing	75.6	65.3	69.5
Provision for credit losses	481.4	8.4	556.9
Interest	166.6	164.2	192.0
Provision for claims	46.4	38.8	37.9
Loss on extinguishment of debt	0.0	0.0	7.4
Total costs and expenses	1,120.7	595.1	1,119.8
Income before provision for income taxes	711.7	1,260.9	549.5
Provision for income taxes	175.9	302.6	128.5
Net income	$ 535.8	$ 958.3	$ 421.0
Net income per share [Abstract]
Basic	$ 39.50	$ 59.57	$ 23.57
Diluted	$ 39.32	$ 59.52	$ 23.47
Weighted average Shares Outstanding [Abstract]
Basic	13,563,885	16,085,823	17,858,935
Diluted	13,625,081	16,100,552	17,935,779