REVENUE RECOGNITION - Contract Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Change in Contract with Customer, Asset [Roll Forward]
Beginning balance	$ 66.6	$ 27.2
Transferred to receivables from contract assets recognized at the beginning of the period	(29.4)	(25.8)
Amortization of costs incurred to obtain a contract with a customer	(12.2)	(4.6)
Costs incurred to obtain a contract with a customer	43.3	40.3
Increases related to revenue recognized, inclusive of adjustments to constraint, during the period	34.3	29.4
Ending balance	102.7	66.6
Contract assets (see Note 2)	53.8	40.5
Contract Assets (long-term), December 31, 2023	48.9
Deferred Sales Commissions
Change in Contract with Customer, Asset [Roll Forward]
Beginning balance	37.2	1.4
Transferred to receivables from contract assets recognized at the beginning of the period	0.0	0.0
Amortization of costs incurred to obtain a contract with a customer	(12.2)	(4.6)
Costs incurred to obtain a contract with a customer	43.3	40.3
Increases related to revenue recognized, inclusive of adjustments to constraint, during the period	0.0	0.0
Ending balance	68.4	37.2
Contract assets (see Note 2)	19.5
Contract Assets (long-term), December 31, 2023	48.9
Finance and insurance, net
Change in Contract with Customer, Asset [Roll Forward]
Beginning balance	14.7	13.5
Transferred to receivables from contract assets recognized at the beginning of the period	(14.7)	(13.5)
Amortization of costs incurred to obtain a contract with a customer	0.0	0.0
Costs incurred to obtain a contract with a customer	0.0	0.0
Increases related to revenue recognized, inclusive of adjustments to constraint, during the period	13.8	14.7
Ending balance	13.8	14.7
Contract assets (see Note 2)	13.8
Contract Assets (long-term), December 31, 2023	0.0
Vehicle repair and maintenance services
Change in Contract with Customer, Asset [Roll Forward]
Beginning balance	14.7	12.3
Transferred to receivables from contract assets recognized at the beginning of the period	(14.7)	(12.3)
Amortization of costs incurred to obtain a contract with a customer	0.0	0.0
Costs incurred to obtain a contract with a customer	0.0	0.0
Increases related to revenue recognized, inclusive of adjustments to constraint, during the period	20.5	14.7
Ending balance	20.5	$ 14.7
Contract assets (see Note 2)	20.5
Contract Assets (long-term), December 31, 2023	$ 0.0