Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 60.4	$ 569.6
Receivables, net	730.0	845.2
Inventory	1,847.9	2,598.5
Other current assets	173.4	139.4
Total Current Assets	2,811.7	4,152.7
PROPERTY AND EQUIPMENT, NET	3,419.5	3,138.1
OPERATING LEASE ASSETS	284.0	309.5
GOODWILL	1,235.3	1,185.0
OTHER INTANGIBLE ASSETS, NET	743.5	521.5
OTHER ASSETS	449.6	580.4
Total Assets	8,943.6	9,887.2
CURRENT LIABILITIES:
Vehicle floorplan payable	1,457.6	2,759.9
Accounts payable	395.9	335.2
Commercial paper	340.0	0.0
Current maturities of long-term debt	12.2	309.2
Accrued payroll and benefits	279.9	225.8
Other current liabilities	574.2	535.8
Total Current Liabilities	3,059.8	4,165.9
LONG-TERM DEBT, NET OF CURRENT MATURITIES	2,846.2	1,792.6
NONCURRENT OPERATING LEASE LIABILITIES	260.1	286.5
DEFERRED INCOME TAXES	78.2	95.9
OTHER LIABILITIES	322.3	310.6
COMMITMENTS AND CONTINGENCIES (Note 20)
SHAREHOLDERS' EQUITY:
Common stock, par value $0.01 per share; 1,500,000,000 shares authorized; 86,562,149 shares issued at December 31, 2021, and 102,562,149 shares issued at December 31, 2020, including shares held in treasury	0.8	1.0
Additional paid-in capital	3.2	53.1
Retained earnings	4,639.9	4,069.4
Treasury stock, at cost; 23,951,543 and 19,078,620 shares held, respectively	(2,266.9)	(887.8)
Total Shareholders' Equity	2,377.0	3,235.7
Total Liabilities and Shareholders' Equity	$ 8,943.6	$ 9,887.2
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	1,500,000,000	1,500,000,000
Common stock issued (in shares)	86,562,149	102,562,149
Treasury stock (in shares)	23,951,543	19,078,620
Trade [Member]
CURRENT LIABILITIES:
Vehicle floorplan payable	$ 489.9	$ 1,541.7
Non-Trade [Member]
CURRENT LIABILITIES:
Vehicle floorplan payable	$ 967.7	$ 1,218.2