Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES:
NET INCOME	$ 205.4	$ 175.5
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	63.0	61.8
Amortization of debt issuance costs and accretion of debt discounts	2.8	2.0
Stock-based compensation expense	17.3	16.7
Provision for credit losses on auto loans receivable	19.6	19.2
Deferred income tax provision	22.2	2.9
(Gain) loss on equity investments	(54.0)	11.5
Loss on corporate-owned life insurance asset	2.9	1.9
Other	0.9	(1.7)
(Increase) decrease, net of effects from business acquisitions and divestitures:
Receivables	119.2	43.0
Auto loans receivable, net	(253.5)	(365.4)
Inventory	(43.9)	169.2
Other assets	(2.9)	29.8
Increase (decrease), net of effects from business acquisitions and divestitures:
Vehicle floorplan payable - trade	(102.2)	(186.5)
Accounts payable	8.5	(45.4)
Other liabilities	16.9	13.0
Net cash provided by (used in) operating activities	22.2	(52.5)
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property and equipment	(56.4)	(75.2)
Cash received from business divestitures, net of cash relinquished	12.7	0.0
Cash paid for business acquisitions, net of cash acquired	0.0	(69.6)
Collections on auto loans receivable acquired through third-party dealers	2.9	5.7
Investments in equity securities	(11.5)	0.0
Other	3.4	3.0
Net cash used in investing activities	(48.9)	(136.1)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Repurchases of common stock	(301.0)	(220.6)
Proceeds from 5.89% Senior Notes due 2035	0.0	500.0
Net proceeds from (payments of) commercial paper	120.0	(290.0)
Proceeds from non-recourse debt	1,102.2	407.0
Payments of non-recourse debt	(858.5)	(153.0)
Payment of debt issuance costs	(3.4)	(4.9)
Net proceeds from (payments of) vehicle floorplan payable - non-trade	36.3	(0.9)
Payments of other debt obligations	(5.0)	(3.3)
Payments of tax withholdings for stock-based awards	(23.8)	(19.9)
Proceeds from the exercise of stock options	0.0	0.2
Net cash provided by financing activities	66.8	214.6
INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	40.1	26.0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH at beginning of period	85.8	103.4
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH at end of period	$ 125.9	$ 129.4