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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) $ in Millions				3 Months Ended
	Jun. 15, 2021 USD ($) derivative	Oct. 02, 2020 USD ($) derivative	Jun. 01, 2019 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) derivative
Derivative [Line Items]
Non-trade floor plan notes payable						$ 835.9				$ 1,208.1
Interest Rate Contract
Derivative [Line Items]
Agreement term			5 years
Aggregate notional amount			$ 300.0
Interest Rate Contract | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Derivative [Line Items]
Amounts reclassified from AOCI to floorplan interest expense				$ (2.7)	$ 0.7	0.7	$ 0.7	$ 0.7	$ 0.7
Interest Rate Contract | Other Non-Current Assets | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Derivative [Line Items]
Amounts reclassified from AOCI to floorplan interest expense				$ (2.7)	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Interest Rate Contract | Not Designated as Hedging Instrument
Derivative [Line Items]
Agreement term	5 years	5 years
Aggregate notional amount	$ 100.0	$ 100.0
Derivative liability										23.8
Derivative asset										$ 23.8
Interest Rate Cap | Not Designated as Hedging Instrument
Derivative [Line Items]
Number of derivative instruments held | derivative	2	2								4

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- Definition

Amounts borrowed to finance the purchase of specific new and program vehicle inventories with lenders that are not captive finance subsidiaries of the manufacturer.

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