DEBT - Schedule of Non-Recourse Notes Payable (Details) - Non-recourse notes payable - Non-recourse $ in Millions	Jun. 30, 2026 USD ($)
Debt Instrument [Line Items]
Balance	$ 2,741.4
Initial Principal Amount	3,263.5
LAD Auto Receivables Trust 2022-1 Class C
Debt Instrument [Line Items]
Balance	11.5
Initial Principal Amount	$ 23.0
LAD Auto Receivables Trust 2022-1 Class C \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	6.85%
LAD Auto Receivables Trust 2022-1 Class C \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.85%
LAD Auto Receivables Trust 2023-1 Class D
Debt Instrument [Line Items]
Balance	$ 25.2
Initial Principal Amount	$ 31.3
LAD Auto Receivables Trust 2023-1 Class D \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	7.30%
LAD Auto Receivables Trust 2023-1 Class D \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	7.30%
LAD Auto Receivables Trust 2023-2 Class C-D
Debt Instrument [Line Items]
Balance	$ 58.8
Initial Principal Amount	$ 79.5
LAD Auto Receivables Trust 2023-2 Class C-D \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	5.58%
LAD Auto Receivables Trust 2023-2 Class C-D \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.30%
LAD Auto Receivables Trust 2023-3 Class B-D
Debt Instrument [Line Items]
Balance	$ 69.4
Initial Principal Amount	$ 79.4
LAD Auto Receivables Trust 2023-3 Class B-D \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	6.09%
LAD Auto Receivables Trust 2023-3 Class B-D \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.92%
LAD Auto Receivables Trust 2023-4 Class A-D
Debt Instrument [Line Items]
Balance	$ 86.5
Initial Principal Amount	$ 121.1
LAD Auto Receivables Trust 2023-4 Class A-D \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	6.24%
LAD Auto Receivables Trust 2023-4 Class A-D \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	7.37%
LAD Auto Receivables Trust 2024-1 Class A-D
Debt Instrument [Line Items]
Balance	$ 84.7
Initial Principal Amount	$ 100.9
LAD Auto Receivables Trust 2024-1 Class A-D \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	5.17%
LAD Auto Receivables Trust 2024-1 Class A-D \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.15%
LAD Auto Receivables Trust 2024-2 Class A-D
Debt Instrument [Line Items]
Balance	$ 138.3
Initial Principal Amount	$ 232.2
LAD Auto Receivables Trust 2024-2 Class A-D \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	5.46%
LAD Auto Receivables Trust 2024-2 Class A-D \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.37%
LAD Auto Receivables Trust 2024-3 Class A-D
Debt Instrument [Line Items]
Balance	$ 259.1
Initial Principal Amount	$ 306.3
LAD Auto Receivables Trust 2024-3 Class A-D \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	4.52%
LAD Auto Receivables Trust 2024-3 Class A-D \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	5.18%
LAD Auto Receivables Trust 2025-1 Class A-D
Debt Instrument [Line Items]
Balance	$ 284.8
Initial Principal Amount	$ 311.4
LAD Auto Receivables Trust 2025-1 Class A-D \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	4.69%
LAD Auto Receivables Trust 2025-1 Class A-D \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	5.52%
LAD Auto Receivables Trust 2025-2 Class A-D
Debt Instrument [Line Items]
Balance	$ 351.9
Initial Principal Amount	$ 443.3
LAD Auto Receivables Trust 2025-2 Class A-D \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	4.25%
LAD Auto Receivables Trust 2025-2 Class A-D \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	5.01%
LAD Auto Receivables Trust 2025-3 Class A-C
Debt Instrument [Line Items]
Balance	$ 440.9
Initial Principal Amount	$ 477.4
LAD Auto Receivables Trust 2025-3 Class A-C \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	4.03%
LAD Auto Receivables Trust 2025-3 Class A-C \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	4.60%
LAD Auto Receivables Trust 2026-1 Class A-C
Debt Instrument [Line Items]
Balance	$ 446.0
Initial Principal Amount	$ 532.1
LAD Auto Receivables Trust 2026-1 Class A-C \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	3.75%
LAD Auto Receivables Trust 2026-1 Class A-C \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	4.42%
LAD Auto Receivables Trust 2026-2 Class A-C
Debt Instrument [Line Items]
Balance	$ 484.3
Initial Principal Amount	$ 525.6
LAD Auto Receivables Trust 2026-2 Class A-C \| Minimum
Debt Instrument [Line Items]
Interest Rate Range	3.92%
LAD Auto Receivables Trust 2026-2 Class A-C \| Maximum
Debt Instrument [Line Items]
Interest Rate Range	4.94%