CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
REVENUE:
New vehicle	$ 2,064.3	$ 1,767.7
Used vehicle	1,356.9	1,126.5
Parts and service	590.4	515.6
Finance and insurance, net	189.7	172.5
TOTAL REVENUE	4,201.2	3,582.3
COST OF SALES:
New vehicle	1,901.4	1,588.8
Used vehicle	1,285.0	1,049.5
Parts and service	256.2	233.5
Finance and insurance	8.6	14.3
TOTAL COST OF SALES	3,451.2	2,886.1
GROSS PROFIT	750.0	696.2
OPERATING EXPENSES:
Selling, general, and administrative	468.6	403.0
Depreciation and amortization	18.7	16.7
INCOME FROM OPERATIONS	262.8	276.5
OTHER EXPENSES:
Floor plan interest expense	22.8	0.6
Other interest expense, net	44.1	37.3
Total other expenses, net	66.9	38.0
INCOME BEFORE INCOME TAXES	195.8	238.5
Income tax expense	48.8	57.1
NET INCOME	$ 147.1	$ 181.4
Basic—
Net income (in dollars per share)	$ 7.24	$ 8.42
Diluted—
Net income (in dollars per share)	$ 7.21	$ 8.37
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	20.3	21.6
Diluted (in shares)	20.4	21.7
Performance share units
WEIGHTED AVERAGE SHARES OUTSTANDING:
Incremental common shares (in shares)	0.1	0.1