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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) dealerships swap | Jun. 30, 2021 USD ($) dealerships swap | Dec. 31, 2020 USD ($) | Aug. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Other deferred costs, net | $ 2,400,000 | $ 2,400,000 |  |
Amount expected to be reclassified from other comprehensive loss into earnings | (9,800,000) | (9,800,000) |  |
Not Designated as Hedging Instrument |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Notional value | 250,000,000.0 | 250,000,000.0 |  |
Accumulated Other Comprehensive Income (Loss) | Floorplan interest expense |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Tax portion of reclassification out of AOCI |  | $ 700,000 |  |
Accumulated Other Comprehensive Income (Loss) | Floorplan interest expense | Not Designated as Hedging Instrument |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Interest Expense | $ 1,000,000.0 |  |  |
Interest Rate Swaps | Not Designated as Hedging Instrument |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Weighted average interest rate (as a percentage) | 1.76% | 1.76% |  |
Interest Rate Swaps | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Weighted average interest rate (as a percentage) | 1.38% | 1.38% |  |
Interest Rate Swaps | Floorplan interest expense | Not Designated as Hedging Instrument |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Number of additional forward interest rate swaps | dealerships | 5 | 5 |  |
Interest Rate Swaps | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Number of additional forward interest rate swaps | swap | 34 | 34 |  |
Notional value | $ 700,400,000 | $ 700,400,000 |  |
Interest Rate Swaps | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Number of additional forward interest rate swaps | swap | 8 | 8 |  |
Notional value | $ 425,000,000.0 | $ 425,000,000.0 |  |
Weighted average interest rate (as a percentage) | 1.20% | 1.20% |  |
Senior Notes | 4.00% Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Debt issued |  |  |  | $ 550,000,000.0
Interest rate (as a percentage) | 4.00% | 4.00% |  |
Demand notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Carrying value | $ 100,100,000 | $ 100,100,000 | $ 60,000,000.0 |

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