CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 147.9	$ 158.4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23.8	22.4
Change in operating lease assets	5.8	6.4
Deferred income taxes	0.6	7.0
Asset impairments	0.0	1.1
Stock-based compensation	7.6	5.8
Amortization of debt discount and issuance costs	0.8	0.7
Gain on disposition of assets	(34.3)	(1.5)
Unrealized gain on derivative instruments	(0.5)	(4.0)
Other	(0.5)	(1.9)
Changes in assets and liabilities, net of acquisitions and dispositions:
Accounts payable and accrued expenses	107.1	27.7
Accounts and notes receivable	(21.7)	(5.3)
Inventories	(74.8)	(172.6)
Contracts-in-transit and vehicle receivables	26.8	42.8
Prepaid expenses and other assets	16.4	10.2
Floorplan notes payable — manufacturer affiliates	55.9	52.4
Deferred revenues	(0.3)	(0.1)
Operating lease liabilities	(6.7)	(6.1)
Net cash provided by operating activities	253.9	143.4
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid for acquisitions, net, including repayment of sellers’ floorplan notes payable of $50.3 and $9.3, respectively	(689.7)	(76.9)
Proceeds from disposition of franchises, property and equipment	125.2	9.2
Purchases of property and equipment	(63.2)	(35.8)
Other	9.5	(1.2)
Net cash used in investing activities	(618.2)	(104.6)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on credit facility — floorplan line and other	3,313.7	2,376.0
Repayments on credit facility — floorplan line and other	(3,304.1)	(2,290.9)
Borrowings on credit facility — acquisition line	320.0	0.0
Repayments on credit facility — acquisition line	(98.0)	(53.2)
Debt issuance costs	(1.6)	(0.1)
Borrowings on other debt	207.2	31.4
Principal payments on other debt	(28.6)	(86.9)
Proceeds from employee stock purchase plan	6.5	5.7
Payments of tax withholding for stock-based compensation	(5.6)	(7.9)
Repurchases of common stock, amounts based on settlement date	(53.8)	(34.7)
Dividends paid	(6.4)	(6.4)
Net cash provided by (used in) financing activities	349.4	(67.0)
Effect of exchange rate changes on cash	(0.3)	1.6
Net decrease in cash and cash equivalents	(15.3)	(26.6)
CASH AND CASH EQUIVALENTS, beginning of period	57.2	47.9
CASH AND CASH EQUIVALENTS, end of period	$ 41.9	$ 21.3