Credit Facilities and Long-term Debt - Schedule of Non-Recourse Notes Payable (Details) - Notes Payable - Nonrecourse - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term Debt	$ 422.2	$ 317.6
Aggregate principal amount	642.4
LAD Auto Receivables Trust 2021-1 Class A
Debt Instrument [Line Items]
Long-term Debt	115.0
Aggregate principal amount	$ 282.8
Debt stated interest rate	1.30%
LAD Auto Receivables Trust 2021-1 Class B
Debt Instrument [Line Items]
Long-term Debt	$ 18.3
Aggregate principal amount	$ 18.3
Debt stated interest rate	1.94%
LAD Auto Receivables Trust 2021-1 Class C
Debt Instrument [Line Items]
Long-term Debt	$ 26.0
Aggregate principal amount	$ 26.0
Debt stated interest rate	2.35%
LAD Auto Receivables Trust 2021-1 Class D
Debt Instrument [Line Items]
Long-term Debt	$ 17.2
Aggregate principal amount	$ 17.2
Debt stated interest rate	3.99%
LAD Auto Receivables Trust 2022-1 Class A
Debt Instrument [Line Items]
Long-term Debt	$ 207.2
Aggregate principal amount	$ 259.7
Debt stated interest rate	5.21%
LAD Auto Receivables Trust 2022-1 Class B
Debt Instrument [Line Items]
Long-term Debt	$ 15.5
Aggregate principal amount	$ 15.5
Debt stated interest rate	5.87%
LAD Auto Receivables Trust 2022-1 Class C
Debt Instrument [Line Items]
Long-term Debt	$ 23.0
Aggregate principal amount	$ 22.9
Debt stated interest rate	6.85%