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Segments - Schedule of Certain Segment Financial Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 2    
Segment Reporting Information [Line Items]      
Total revenues $ 31,042.3 $ 28,187.8 $ 22,831.7
Gross profit 5,228.9 5,152.4 4,259.0
Floor plan interest expense (150.9) (38.8) (22.3)
Selling, general and administrative (3,294.8) (3,044.1) (2,480.8)
Operating income 1,692.4 1,941.1 1,662.5
Depreciation and amortization (195.8) (163.2) (124.8)
Income before income taxes 1,362.3 1,730.0 1,484.8
Depreciation and amortization (204.1) (172.7) (127.3)
Other interest expense (201.2) (129.1) (103.4)
Other income (expense), net 22.0 (43.2) (52.0)
Operating Segments      
Segment Reporting Information [Line Items]      
Floor plan interest expense (150.9) (38.8) (22.3)
Income before income taxes 1,549.5 1,851.6 1,684.5
Operating Segments | Vehicle Operations      
Segment Reporting Information [Line Items]      
Total revenues 31,042.3 28,187.8 22,831.7
Gross profit 5,228.9 5,154.3 4,263.9
Selling, general and administrative (3,482.6) (3,260.0) (2,568.0)
Operating income 1,595.4 1,855.5 1,673.6
Operating Segments | Financing Operations      
Segment Reporting Information [Line Items]      
Selling, general and administrative (36.7) (32.0) (18.2)
Interest, fee, and lease income 268.5 134.1 45.9
Interest expense (170.5) (52.2) (4.8)
Total interest margin 98.0 81.9 41.1
Total pre-provision income 61.3 49.9 22.9
Provision for loan and lease losses (98.8) (44.4) (9.4)
Depreciation and amortization (8.4) (9.5) (2.5)
Financing operations (loss) income (45.9) (4.0) 11.0
Corporate and Other      
Segment Reporting Information [Line Items]      
Income before income taxes 187.8 213.9 80.4
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Depreciation and amortization (195.8) (163.2) (124.8)
Other interest expense (201.2) (129.1) (103.4)
Other income (expense), net $ 22.0 $ (43.2) $ (52.0)