v3.26.1
REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Revenues $ 4,384.6 $ 4,373.1 $ 8,497.6 $ 8,521.6
New and used vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 3,566.2 3,589.7 6,873.3 6,963.5
New vehicle        
Disaggregation of Revenue [Line Items]        
Revenues 2,330.2 2,303.9 4,431.0 4,442.0
Used vehicle retail        
Disaggregation of Revenue [Line Items]        
Revenues 1,094.0 1,129.4 2,153.6 2,208.3
Used vehicle wholesale        
Disaggregation of Revenue [Line Items]        
Revenues 141.9 156.3 288.7 313.2
Sale of vehicle parts and accessories        
Disaggregation of Revenue [Line Items]        
Revenues 123.2 124.4 250.9 249.9
Vehicle repair and maintenance services        
Disaggregation of Revenue [Line Items]        
Revenues 511.4 477.1 1,010.5 939.2
Parts and services        
Disaggregation of Revenue [Line Items]        
Revenues 634.6 601.5 1,261.4 1,189.1
Finance and insurance, net        
Disaggregation of Revenue [Line Items]        
Revenues $ 183.8 $ 182.0 $ 362.9 $ 368.9