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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Total revenue $ 17,188.6 $ 14,802.7 $ 15,433.8
New and used vehicle      
Disaggregation of Revenue [Line Items]      
Total revenue 14,067.9 12,045.0 12,562.6
New and used vehicle | New vehicle      
Disaggregation of Revenue [Line Items]      
Total revenue 8,849.7 7,630.7 7,365.6
New and used vehicle | Used vehicle retail      
Disaggregation of Revenue [Line Items]      
Total revenue 4,605.9 4,017.5 4,828.8
New and used vehicle | Used vehicle wholesale      
Disaggregation of Revenue [Line Items]      
Total revenue 612.3 396.7 368.3
Parts and services      
Disaggregation of Revenue [Line Items]      
Total revenue 2,354.7 2,081.5 2,074.2
Parts and services | Sale of vehicle parts and accessories      
Disaggregation of Revenue [Line Items]      
Total revenue 516.2 496.3 510.2
Parts and services | Vehicle repair and maintenance services      
Disaggregation of Revenue [Line Items]      
Total revenue 1,838.5 1,585.3 1,564.1
Finance and insurance, net      
Disaggregation of Revenue [Line Items]      
Total revenue $ 766.0 $ 676.2 $ 797.0