Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows From Operating Activities:
Net income	$ 740.7	$ 254.7
Adjustments to reconcile cash provided by operating activities:
Provision for credit losses	(17.5)	464.3
Depreciation	7.2	6.4
Amortization	12.5	11.1
Benefit from deferred income taxes	(4.1)	(16.4)
Stock-based compensation	5.4	4.7
Loss on extinguishment of debt	0.0	7.4
Other	(0.3)	(0.6)
Change in operating assets and liabilities:
Increase (decrease) in accounts payable and accrued liabilities	65.5	(20.3)
Decrease in income taxes receivable	122.0	57.5
Decrease in other assets	6.9	14.2
Net cash provided by operating activities	938.3	783.0
Payments to Acquire Debt Securities, Available-for-sale	31.4	37.8
Cash Flows From Investing Activities:
Proceeds from sale of restricted securities available for sale	12.0	19.4
Maturities of restricted securities available for sale	16.9	12.4
Principal collected on Loans receivable	2,907.5	2,412.7
Advances to Dealers	(1,626.2)	(1,751.1)
Purchases of Consumer Loans	(905.3)	(1,161.4)
Accelerated payments of Dealer Holdback	(36.0)	(34.6)
Payments of Dealer Holdback	(117.2)	(109.9)
Purchases of property and equipment	(6.1)	(7.7)
Net cash provided by (used in) in investing activities	214.2	(658.0)
Cash Flows From Financing Activities:
Borrowings under revolving secured line of credit	1,066.4	4,387.8
Repayments under revolving secured line of credit	(1,090.1)	(4,262.1)
Proceeds from secured financing	1,379.8	2,071.9
Repayments of secured financing	(1,355.7)	(1,719.6)
Repayment of senior notes	0.0	401.8
Payments of debt issuance costs and debt extinguishment costs	(12.3)	(12.5)
Repurchase of common stock	(1,093.9)	(307.1)
Other	(0.6)	1.5
Net cash used in financing activities	(1,106.4)	(241.9)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents	46.1	(116.9)
Cash and cash equivalents and restricted cash and cash equivalents beginning of period	396.2	517.7
Cash and cash equivalents and restricted cash and cash equivalents end of period	442.3	400.8
Supplemental Disclosure of Cash Flow Information:
Cash paid during the period for interest	115.9	147.2
Cash paid during the period for income taxes, net of refunds	$ 112.3	$ 35.8