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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) country store state province brand	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of stores | store	296
Number of new vehicle brands | brand	48
Number of countries | country	2
Number of states | state	28
Number of provinces | province	3
Debt Instrument [Line Items]
Threshold period for interest to bear on receivables	60 days
Finance receivables, threshold period past due	120 days
Interest costs capitalized	$ 2.6	$ 2.0	$ 1.6
Accrued warranty balance	$ 0.3	0.6
Customer returns on sales, threshold period past due	30 days
Contract liability	$ 284.3	239.0
Contract liability, revenue recognized	44.6	35.0
Contract asset	$ 12.5	$ 9.6
Loans receivables | Auto loan receivables
Debt Instrument [Line Items]
Loan receivables aged less than 60 days past due, percent (more than)	98.00%
Loan receivable on non-accrual status, percent (less than)	2.00%
Allowance for credit losses	$ 69.3
Minimum
Debt Instrument [Line Items]
Period that contracts in transit are outstanding	5 days
Maximum
Debt Instrument [Line Items]
Period that contracts in transit are outstanding	10 days

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