INVENTORIES (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Inventory [Line Items]
Total inventories	$ 2,985.0	$ 2,385.5
New vehicles
Inventory [Line Items]
Total inventories	1,059.2	812.9
Used vehicles
Inventory [Line Items]
Total inventories	1,745.5	1,418.3
Parts and accessories
Inventory [Line Items]
Total inventories	$ 180.3	$ 154.3