v3.26.1
Segment Information - Revenues and Segment Income by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting        
Revenues $ 8,512.7 $ 8,032.5 $ 16,376.3 $ 15,986.3
Cost of sales 7,155.7 6,680.3 13,719.9 13,312.7
Selling, general, and administrative expenses:        
Personnel expenses 584.4 577.2 1,151.0 1,134.5
Advertising expenses 31.9 33.6 62.9 64.5
Rent & related expenses 114.4 111.7 230.9 220.9
Other expenses 243.3 221.3 494.8 475.3
Depreciation 45.4 43.1 90.2 83.7
Floor plan interest expense 38.5 43.8 76.6 85.8
Other interest expense 33.1 21.6 61.5 44.1
Equity in earnings of affiliates 57.3 53.6 98.1 86.9
Segment income 353.8 353.5 677.5 704.0
Gain on sale of dealerships 30.5 0.0 90.9 52.3
Retail Automotive        
Segment Reporting        
Revenues 7,301.0 6,887.7 14,268.1 13,806.3
Cost of sales 6,144.5 5,723.3 11,986.6 11,505.7
Selling, general, and administrative expenses:        
Personnel expenses 498.0 492.6 981.3 965.1
Advertising expenses 30.7 32.0 60.4 61.6
Rent & related expenses 103.4 101.4 208.6 200.5
Other expenses 221.3 208.1 449.7 440.9
Depreciation 39.4 37.5 78.3 72.7
Floor plan interest expense 34.4 36.7 68.8 72.7
Other interest expense 30.0 17.5 56.5 35.5
Equity in earnings of affiliates 0.0 0.3 0.0 0.5
Segment income 229.8 238.9 468.8 504.4
Retail Commercial Truck        
Segment Reporting        
Revenues 927.8 943.6 1,622.4 1,767.3
Cost of sales 785.0 800.0 1,351.4 1,482.7
Selling, general, and administrative expenses:        
Personnel expenses 66.0 65.4 129.2 131.3
Advertising expenses 0.7 0.8 1.4 1.7
Rent & related expenses 6.6 6.8 13.5 13.4
Other expenses 15.1 7.4 29.4 22.2
Depreciation 4.4 4.1 8.8 8.1
Floor plan interest expense 2.8 4.9 5.2 8.6
Other interest expense 0.0 0.0 0.0 0.0
Equity in earnings of affiliates 0.0 0.0 0.0 0.0
Segment income 47.2 54.2 83.5 99.3
Other        
Segment Reporting        
Revenues 283.9 201.2 485.8 412.7
Cost of sales 226.2 157.0 381.9 324.3
Selling, general, and administrative expenses:        
Personnel expenses 20.4 19.2 40.5 38.1
Advertising expenses 0.5 0.8 1.1 1.2
Rent & related expenses 4.4 3.5 8.8 7.0
Other expenses 6.9 5.8 15.7 12.2
Depreciation 1.6 1.5 3.1 2.9
Floor plan interest expense 1.3 2.2 2.6 4.5
Other interest expense 3.1 4.1 5.0 8.6
Equity in earnings of affiliates 0.0 0.0 0.0 0.0
Segment income 19.5 7.1 27.1 13.9
Non-Automotive Investments        
Segment Reporting        
Revenues 0.0 0.0 0.0 0.0
Cost of sales 0.0 0.0 0.0 0.0
Selling, general, and administrative expenses:        
Personnel expenses 0.0 0.0 0.0 0.0
Advertising expenses 0.0 0.0 0.0 0.0
Rent & related expenses 0.0 0.0 0.0 0.0
Other expenses 0.0 0.0 0.0 0.0
Depreciation 0.0 0.0 0.0 0.0
Floor plan interest expense 0.0 0.0 0.0 0.0
Other interest expense 0.0 0.0 0.0 0.0
Equity in earnings of affiliates 57.3 53.3 98.1 86.4
Segment income $ 57.3 $ 53.3 $ 98.1 $ 86.4