v3.25.2
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Increase (Decrease) in AOCI        
Beginning balance $ 2,992.5 $ 2,772.4 $ 2,974.3 $ 2,674.4
Other comprehensive income (loss) before reclassifications:        
Pre-tax     60.9 20.1
Tax effect     2.1 (6.1)
Amount reclassified from accumulated other comprehensive income (loss):        
Provision for income taxes     3.2 4.7
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 38.9 (3.3) 52.7 (1.2)
Ending balance 3,136.0 2,866.3 3,136.0 2,866.3
Interest Rate Swaps        
Amount reclassified from accumulated other comprehensive income (loss):        
Pre-tax       (0.2)
Floorplan interest expense (pre-tax)        
Amount reclassified from accumulated other comprehensive income (loss):        
Pre-tax     (8.0) (10.6)
Other interest expense, net (pre-tax)        
Amount reclassified from accumulated other comprehensive income (loss):        
Pre-tax     (5.6) (9.0)
Accumulated Other Comprehensive Income (Loss)        
Increase (Decrease) in AOCI        
Beginning balance 15.4 30.3 1.6 28.1
Amount reclassified from accumulated other comprehensive income (loss):        
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 38.9 (3.3) 52.7 (1.2)
Ending balance 54.4 27.0 54.4 27.0
Accumulated Income (Loss) On Foreign Currency Translation        
Increase (Decrease) in AOCI        
Beginning balance     (56.5) (37.4)
Other comprehensive income (loss) before reclassifications:        
Pre-tax     69.8 (5.6)
Tax effect     0.0 0.0
Amount reclassified from accumulated other comprehensive income (loss):        
Provision for income taxes     0.0 0.0
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX     69.8 (5.6)
Ending balance 13.3 (43.0) 13.3 (43.0)
Accumulated Income (Loss) On Foreign Currency Translation | Interest Rate Swaps        
Amount reclassified from accumulated other comprehensive income (loss):        
Pre-tax       0.0
Accumulated Income (Loss) On Foreign Currency Translation | Floorplan interest expense (pre-tax)        
Amount reclassified from accumulated other comprehensive income (loss):        
Pre-tax     0.0 0.0
Accumulated Income (Loss) On Foreign Currency Translation | Other interest expense, net (pre-tax)        
Amount reclassified from accumulated other comprehensive income (loss):        
Pre-tax     0.0 0.0
Accumulated Income (Loss) On Interest Rate Swaps        
Increase (Decrease) in AOCI        
Beginning balance     58.2 65.6
Other comprehensive income (loss) before reclassifications:        
Pre-tax     (8.8) 25.7
Tax effect     2.1 (6.1)
Amount reclassified from accumulated other comprehensive income (loss):        
Provision for income taxes     3.2 4.7
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX     (17.1) 4.4
Ending balance $ 41.1 $ 70.0 41.1 70.0
Accumulated Income (Loss) On Interest Rate Swaps | Interest Rate Swaps        
Amount reclassified from accumulated other comprehensive income (loss):        
Pre-tax       (0.2)
Accumulated Income (Loss) On Interest Rate Swaps | Floorplan interest expense (pre-tax)        
Amount reclassified from accumulated other comprehensive income (loss):        
Pre-tax     (8.0) (10.6)
Accumulated Income (Loss) On Interest Rate Swaps | Other interest expense, net (pre-tax)        
Amount reclassified from accumulated other comprehensive income (loss):        
Pre-tax     $ (5.6) $ (9.0)