v3.26.1
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Increase (Decrease) in AOCI    
Beginning balance $ 2,789.1 $ 2,974.3
Other comprehensive income (loss) before reclassifications:    
Pre-tax (7.2) 17.4
Tax effect (0.9) 1.5
Amount reclassified from accumulated other comprehensive income (loss):    
Provision for income taxes 1.3 1.6
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX (12.3) 13.8
Ending balance 2,839.6 2,992.5
Interest Rate Swaps    
Amount reclassified from accumulated other comprehensive income (loss):    
Pre-tax (0.8)  
Floorplan interest expense (pre-tax)    
Amount reclassified from accumulated other comprehensive income (loss):    
Pre-tax (2.7) (4.0)
Other interest expense, net (pre-tax)    
Amount reclassified from accumulated other comprehensive income (loss):    
Pre-tax (2.1) (2.9)
Accumulated Other Comprehensive Income (Loss)    
Increase (Decrease) in AOCI    
Beginning balance 31.6 1.6
Amount reclassified from accumulated other comprehensive income (loss):    
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX (12.3) 13.8
Ending balance 19.3 15.4
Accumulated Income (Loss) On Foreign Currency Translation    
Increase (Decrease) in AOCI    
Beginning balance (1.7) (56.5)
Other comprehensive income (loss) before reclassifications:    
Pre-tax (11.0) 23.9
Tax effect 0.0 0.0
Amount reclassified from accumulated other comprehensive income (loss):    
Provision for income taxes 0.0 0.0
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX (11.0) 23.9
Ending balance (12.7) (32.6)
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 33.3 58.2
Other comprehensive income (loss) before reclassifications:    
Pre-tax 3.8 (6.5)
Tax effect (0.9) 1.5
Amount reclassified from accumulated other comprehensive income (loss):    
Provision for income taxes 1.3 1.6
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX (1.4) (10.1)
Ending balance 31.9 48.1
Accumulated Income (Loss) On Interest Rate Swaps | Interest Rate Swaps    
Amount reclassified from accumulated other comprehensive income (loss):    
Pre-tax (0.8)  
Accumulated Income (Loss) On Interest Rate Swaps | Floorplan interest expense (pre-tax)    
Amount reclassified from accumulated other comprehensive income (loss):    
Pre-tax (2.7) (4.0)
Accumulated Income (Loss) On Interest Rate Swaps | Other interest expense, net (pre-tax)    
Amount reclassified from accumulated other comprehensive income (loss):    
Pre-tax $ (2.1) $ (2.9)