Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows From Operating Activities:
Net income	$ 494.2	$ 422.1
Adjustments to reconcile cash provided by operating activities:
Provision for credit losses	49.2	39.2
Depreciation	5.3	3.9
Amortization	11.3	10.0
Provision for deferred income taxes	34.2	48.5
Stock-based compensation	5.7	7.8
Other	0.1	(0.2)
Change in operating assets and liabilities:
Increase (decrease) in accounts payable and accrued liabilities	(4.8)	21.0
Increase in income taxes receivable	(2.9)	(18.0)
Decrease in income taxes payable	(2.3)	(39.7)
Decrease in other assets	18.0	6.4
Net cash provided by operating activities	608.0	501.0
Cash Flows From Investing Activities:
Purchases of restricted securities available for sale	(32.8)	(35.6)
Proceeds from sale of restricted securities available for sale	24.9	17.3
Maturities of restricted securities available for sale	8.1	7.2
Principal collected on Loans receivable	2,254.9	1,949.0
Advances to Dealers	(1,901.1)	(1,870.2)
Purchases of Consumer Loans	(1,053.9)	(917.0)
Accelerated payments of Dealer Holdback	(44.1)	(41.0)
Payments of Dealer Holdback	(105.4)	(98.0)
Purchases of property and equipment	(23.6)	(22.1)
Net cash used in investing activities	(873.0)	(1,010.4)
Cash Flows From Financing Activities:
Borrowings under revolving secured line of credit	3,027.2	1,724.7
Repayments under revolving secured line of credit	(3,146.9)	(1,738.6)
Proceeds from secured financing	1,698.4	2,696.6
Repayments of secured financing	(1,563.0)	(1,886.0)
Proceeds from issuance of senior notes	400.0	0.0
Proceeds from mortgage note	0.0	12.0
Payments of debt issuance costs	(15.9)	(13.0)
Repurchase of common stock	(109.2)	(2.0)
Other	(0.4)	(4.8)
Net cash provided by financing activities	290.2	788.9
Net increase in cash and cash equivalents and restricted cash and cash equivalents	25.2	279.5
Cash and cash equivalents and restricted cash and cash equivalents beginning of period	329.3	263.8
Cash and cash equivalents and restricted cash and cash equivalents end of period	354.5	543.3
Supplemental Disclosure of Cash Flow Information:
Cash paid during the period for interest	141.6	112.0
Cash paid during the period for income taxes	$ 116.7	$ 136.6