Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash Flows From Operating Activities:
Net income	$ 121.7	$ 321.7
Adjustments to reconcile cash provided by operating activities:
Provision for credit losses	387.9	170.8
Depreciation	4.4	4.6
Amortization	8.4	8.5
Provision for deferred income taxes	21.8	5.7
Stock-based compensation	19.7	18.2
Other	0.4	0.1
Change in operating assets and liabilities:
Increase in accounts payable and accrued liabilities	3.3	37.2
Decrease (increase) in income taxes receivable	(5.0)	57.0
Decrease in income taxes payable	(2.3)	0.0
Decrease in other assets	18.9	1.8
Net cash provided by operating activities	579.2	625.6
Payments to Acquire Debt Securities, Available-for-sale	20.9	24.4
Cash Flows From Investing Activities:
Proceeds from sale of restricted securities available for sale	7.6	6.3
Maturities of restricted securities available for sale	4.2	10.9
Principal collected on Loans receivable	1,593.7	1,855.5
Advances to Dealers	(1,470.4)	(1,320.0)
Purchases of Consumer Loans	(680.9)	(578.4)
Accelerated payments of Dealer Holdback	(24.6)	(24.9)
Payments of Dealer Holdback	(118.3)	(90.4)
Purchases of property and equipment	(2.4)	(1.0)
Net cash used in investing activities	(712.0)	(166.4)
Cash Flows From Financing Activities:
Borrowings under revolving secured lines of credit	3,509.5	3,876.1
Repayments under revolving secured lines of credit	(3,371.5)	(3,658.0)
Proceeds from secured financing	1,201.0	729.8
Repayments of secured financing	(1,181.1)	(773.9)
Payments of debt issuance costs	(11.2)	(7.0)
Repurchase of common stock	(22.7)	(652.7)
Proceeds from Issuance of Common Stock	4.1	11.1
Other	(1.0)	12.0
Net cash provided by (used in) financing activities	127.1	(462.6)
Net decrease in cash and cash equivalents and restricted cash and cash equivalents	(5.7)	(3.4)
Cash and cash equivalents and restricted cash and cash equivalents beginning of period	417.7	434.2
Cash and cash equivalents and restricted cash and cash equivalents end of period	412.0	430.8
Supplemental Disclosure of Cash Flow Information:
Cash paid during the period for interest	107.5	66.8
Cash paid during the period for income taxes, net of refunds	$ 18.3	$ 37.9