INVENTORIES (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Components of Inventory [Line Items] | |||||
| Total inventories | $ 2,108.6 | $ 2,108.6 | $ 2,135.8 | ||
| Reduction of new vehicle inventory cost by automobile manufacturer incentives | (8.6) | (8.6) | (9.0) | ||
| Held-for-sale | |||||
| Components of Inventory [Line Items] | |||||
| Total inventories | 28.5 | 28.5 | 96.5 | ||
| New vehicles | |||||
| Components of Inventory [Line Items] | |||||
| Total inventories | 1,510.7 | 1,510.7 | 1,582.6 | ||
| Reduction of new vehicle inventory cost by automobile manufacturer incentives | (14.2) | (14.2) | (16.2) | ||
| Reduction to cost of sales | 30.5 | $ 32.3 | 57.8 | $ 61.4 | |
| Used vehicles | |||||
| Components of Inventory [Line Items] | |||||
| Total inventories | 447.6 | 447.6 | 399.9 | ||
| Parts and accessories | |||||
| Components of Inventory [Line Items] | |||||
| Total inventories | $ 150.3 | $ 150.3 | $ 153.3 | ||