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SEGMENT INFORMATION - Reconciliation of Segment Information to Consolidated Information (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]        
Revenues   $ 17,188.6 $ 14,802.7 $ 15,433.8
TOTAL COST OF SALES   (14,240.0) (12,046.9) (12,333.3)
Other operating income   0.0 0.0 4.4
Asset impairments $ (44.1) (149.5) (117.2) 0.0
Other interest expense, net   (179.1) (156.1) (152.2)
Gain on dealership divestitures, net   8.6 13.5 207.1
Advertising   61.8 47.5 50.1
Depreciation and amortization   75.0 67.7 69.0
Floor plan interest expense   89.9 9.6 8.4
INCOME FROM OPERATIONS   (835.6) (953.5) (1,272.6)
INCOME BEFORE INCOME TAXES   575.3 801.3 1,319.1
Finance And Insurance, Net        
Segment Reporting Information [Line Items]        
Revenues   766.0 676.2 797.0
TOTAL COST OF SALES   (54.4) (37.9) (46.3)
Dealerships        
Segment Reporting Information [Line Items]        
Revenues   16,885.0 14,517.5 15,188.1
TCA        
Segment Reporting Information [Line Items]        
Revenues   303.6 285.2 245.8
Operating Segments        
Segment Reporting Information [Line Items]        
Revenues   17,411.1 14,984.2 15,586.9
Other interest expense, net   (179.1) (156.1) (152.2)
INCOME FROM OPERATIONS   (889.5) (1,025.0) (1,219.0)
Operating Segments | Dealerships        
Segment Reporting Information [Line Items]        
Revenues   17,107.5 14,699.0 15,341.1
Other interest expense, net   (179.1) (156.1) (152.2)
Personnel costs   1,256.2 1,106.5 1,273.6
Rent and related expenses   142.3 118.7 121.4
Advertising   61.8 47.3 50.0
Other selling, general and administrative expense   441.0 366.0 341.3
Other segment items   0.0 0.0 0.0
Depreciation and amortization   74.6 67.1 68.2
Floor plan interest expense   89.9 9.6 8.4
INCOME FROM OPERATIONS   (816.7) (955.9) (1,173.1)
Operating Segments | Dealerships | New Vehicle        
Segment Reporting Information [Line Items]        
TOTAL COST OF SALES   (8,209.3) (6,927.8) (6,521.6)
Operating Segments | Dealerships | Used Vehicle        
Segment Reporting Information [Line Items]        
TOTAL COST OF SALES   (4,972.7) (4,150.2) (4,843.8)
Operating Segments | Dealerships | Parts And Service        
Segment Reporting Information [Line Items]        
TOTAL COST OF SALES   (1,043.0) (949.9) (939.7)
Operating Segments | Dealerships | Finance And Insurance, Net        
Segment Reporting Information [Line Items]        
TOTAL COST OF SALES   0.0 0.0 0.0
Operating Segments | TCA        
Segment Reporting Information [Line Items]        
Revenues   303.6 285.2 245.8
Other interest expense, net   0.0 0.0 0.0
Personnel costs   0.0 0.0 0.0
Rent and related expenses   0.0 0.0 0.0
Advertising   0.0 0.0 0.0
Other selling, general and administrative expense   0.0 0.0 0.0
Other segment items   7.0 7.4 7.0
Depreciation and amortization   0.4 0.7 0.8
Floor plan interest expense   0.0 0.0 0.0
INCOME FROM OPERATIONS   (72.8) (69.0) (46.0)
Operating Segments | TCA | New Vehicle        
Segment Reporting Information [Line Items]        
TOTAL COST OF SALES   0.0 0.0 0.0
Operating Segments | TCA | Used Vehicle        
Segment Reporting Information [Line Items]        
TOTAL COST OF SALES   0.0 0.0 0.0
Operating Segments | TCA | Parts And Service        
Segment Reporting Information [Line Items]        
TOTAL COST OF SALES   0.0 0.0 0.0
Operating Segments | TCA | Finance And Insurance, Net        
Segment Reporting Information [Line Items]        
TOTAL COST OF SALES   (223.4) (208.1) (191.9)
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenues   (222.5) (181.5) (153.0)
TOTAL COST OF SALES   208.5 189.1 163.8
Deferral of SG&A expense (related to capitalized contracts offset by amortization)   19.7 28.5 30.0
Other interest expense, net   0.0 0.0 0.0
INCOME FROM OPERATIONS   5.8 36.1 40.8
Intersegment Eliminations | Dealerships        
Segment Reporting Information [Line Items]        
Revenues   (222.5) (181.5) (153.0)
Intersegment Eliminations | TCA        
Segment Reporting Information [Line Items]        
Revenues   $ 0.0 $ 0.0 $ 0.0