Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 60.8	$ 72.6
Receivables, net of allowance for credit losses of $2.1 million and $1.7 million, respectively	1,040.4	858.8
Inventory	3,033.4	2,048.3
Other current assets	172.3	158.3
Total Current Assets	4,306.9	3,138.0
AUTO LOANS RECEIVABLE, net of allowance for credit losses of $46.3 million and $57.5 million, respectively	402.4	303.1
PROPERTY AND EQUIPMENT, NET	3,791.6	3,607.2
OPERATING LEASE ASSETS	392.1	323.5
GOODWILL	1,465.8	1,320.1
OTHER INTANGIBLE ASSETS, NET	927.8	837.0
OTHER ASSETS	693.4	530.8
Total Assets	11,980.0	10,059.7
CURRENT LIABILITIES:
Vehicle floorplan payable	3,382.4	2,109.3
Accounts payable	344.7	327.6
Commercial paper	440.0	50.0
Current maturities of long-term debt	462.4	12.6
Current portion of non-recourse debt	8.8	10.7
Accrued payroll and benefits	239.0	238.0
Other current liabilities	705.2	657.5
Total Current Liabilities	5,582.5	3,405.7
LONG-TERM DEBT, NET OF CURRENT MATURITIES	3,127.9	3,586.9
NON-RECOURSE DEBT, NET OF CURRENT PORTION	249.6	312.9
NONCURRENT OPERATING LEASE LIABILITIES	363.2	296.9
DEFERRED INCOME TAXES	85.0	76.5
OTHER LIABILITIES	360.4	333.0
COMMITMENTS AND CONTINGENCIES (Note 20)
SHAREHOLDERS' EQUITY:
Common stock, par value $0.01 per share; 1,500,000,000 shares authorized; 63,562,149 shares issued at December 31, 2023, and 63,562,149 shares issued at December 31, 2022, including shares held in treasury	0.6	0.6
Additional paid-in capital	22.4	3.1
Retained earnings	4,643.0	3,663.7
Treasury stock, at cost; 21,917,635 and 15,915,358 shares held, respectively	(2,454.6)	(1,619.6)
Total Shareholders’ Equity	2,211.4	2,047.8
Total Liabilities and Shareholders’ Equity	11,980.0	10,059.7
Trade [Member]
CURRENT LIABILITIES:
Vehicle floorplan payable	1,760.0	946.6
Non-Trade [Member]
CURRENT LIABILITIES:
Vehicle floorplan payable	$ 1,622.4	$ 1,162.7