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Segment Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) segments | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | segments |  | 4 |  |  |
Revenues |  | $ 26,765.4 | $ 26,948.9 | $ 26,985.0 |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 21,980.0 | 21,817.4 | 21,719.7 |
Selling, general and administrative expenses: |  |  |  |  |
Advertising |  | 255.5 | 243.5 | 184.3 |
Selling, General and Administrative Expense, Total |  | 3,263.9 | 3,253.2 | 3,026.1 |
Depreciation and amortization |  | 240.7 | 220.5 | 200.3 |
Floorplan interest expense |  | 218.9 | 144.7 | 41.4 |
Finance income (loss) [Abstract] |  |  |  |  |
Gain on sale of auto loans receivable |  | 7.4 | 8.1 | 0.0 |
AutoNation finance income (loss) |  | (9.3) | (13.9) | (37.6) |
Corporate and other income and adjustments |  | (311.3) | (365.8) | (247.9) |
Other interest expense |  | (179.7) | (181.4) | (134.9) |
Other non-operating income |  | 9.8 | 24.4 | (14.7) |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  | 916.7 | 1,350.2 | 1,833.5 |
Capital Expenditures | [1] | 308.0 | 416.0 | 336.2 |
Segment assets |  | 13,001.7 | 11,980.0 | 10,059.7 |
Segment Reporting, Reconciling Item, Corporate Nonsegment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 1,328.3 | 1,228.4 | 1,029.1 |
Selling, general and administrative expenses: |  |  |  |  |
Depreciation and amortization |  | 72.9 | 60.8 | 50.7 |
Floorplan interest expense |  | 6.3 | 12.0 | 7.2 |
Finance income (loss) [Abstract] |  |  |  |  |
Capital Expenditures | [1] | 117.9 | 137.5 | 106.7 |
Segment assets | [2] | 3,460.9 | 3,500.4 | 3,195.2 |
New Vehicle [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 13,048.2 | 12,767.4 | 11,754.4 |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 12,272.7 | 11,705.6 | 10,387.8 |
Used Vehicle [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 7,719.9 | 8,198.5 | 9,661.8 |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 7,281.4 | 7,690.5 | 9,108.7 |
Parts and Service [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 4,614.6 | 4,533.7 | 4,100.6 |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 2,405.6 | 2,394.4 | 2,200.3 |
Product and Service, Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 22.6 | 30.5 | 30.9 |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 20.3 | 26.9 | 22.9 |
AN Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 25,437.1 | 25,720.5 | 25,955.9 |
AN Reportable Segment, Franchised Dealerships [Member] | Operating Segments |  |  |  |  |
Selling, general and administrative expenses: |  |  |  |  |
Franchise dealerships - segment income |  | 1,407.2 | 1,886.9 | 2,268.6 |
AN Reportable Segment, Domestic [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 7,140.3 | 7,573.2 | 7,987.5 |
AN Reportable Segment, Domestic [Member] | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 7,140.3 | 7,573.2 | 7,987.5 |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 5,990.8 | 6,274.0 | 6,595.9 |
Selling, general and administrative expenses: |  |  |  |  |
Compensation |  | 497.2 | 515.2 | 535.2 |
Advertising |  | 68.7 | 65.6 | 50.7 |
Store overhead |  | 200.5 | 202.2 | 188.3 |
Selling, General and Administrative Expense, Total |  | 766.4 | 783.0 | 774.2 |
Depreciation and amortization |  | 44.3 | 43.6 | 39.1 |
Floorplan interest expense |  | 84.0 | 57.3 | 14.4 |
Other income | [3] | (0.1) | (0.1) | (1.4) |
Franchise dealerships - segment income |  | 254.9 | 415.4 | 565.3 |
Finance income (loss) [Abstract] |  |  |  |  |
Capital Expenditures | [1] | 46.5 | 102.0 | 32.8 |
Segment assets |  | 2,407.8 | 2,507.7 | 1,974.3 |
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 3,527.1 | 3,525.0 | 3,409.1 |
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 3,389.2 | 3,301.6 | 3,094.3 |
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 2,057.5 | 2,428.4 | 3,022.3 |
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 1,963.9 | 2,303.5 | 2,878.2 |
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 1,146.0 | 1,184.7 | 1,092.7 |
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 632.1 | 667.4 | 621.7 |
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 7.2 | 3.1 | 3.1 |
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 5.6 | 1.5 | 1.7 |
AN Reportable Segment, Import [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 8,156.9 | 7,880.9 | 7,690.3 |
AN Reportable Segment, Import [Member] | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 8,156.9 | 7,880.9 | 7,690.3 |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 6,719.3 | 6,333.8 | 6,109.0 |
Selling, general and administrative expenses: |  |  |  |  |
Compensation |  | 575.8 | 578.6 | 576.8 |
Advertising |  | 83.8 | 76.1 | 61.1 |
Store overhead |  | 217.7 | 196.8 | 168.9 |
Selling, General and Administrative Expense, Total |  | 877.3 | 851.5 | 806.8 |
Depreciation and amortization |  | 43.9 | 39.2 | 35.6 |
Floorplan interest expense |  | 39.9 | 21.5 | 4.8 |
Other income | [3] | (0.1) | (0.1) | (0.1) |
Franchise dealerships - segment income |  | 476.6 | 635.0 | 734.2 |
Finance income (loss) [Abstract] |  |  |  |  |
Capital Expenditures | [1] | 85.7 | 106.6 | 70.1 |
Segment assets |  | 2,184.8 | 2,034.6 | 1,555.6 |
AN Reportable Segment, Import [Member] | New Vehicle [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 4,320.0 | 3,996.0 | 3,473.0 |
AN Reportable Segment, Import [Member] | New Vehicle [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 4,066.2 | 3,644.3 | 3,054.3 |
AN Reportable Segment, Import [Member] | Used Vehicle [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 2,162.5 | 2,222.2 | 2,652.7 |
AN Reportable Segment, Import [Member] | Used Vehicle [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 2,029.9 | 2,073.3 | 2,486.8 |
AN Reportable Segment, Import [Member] | Parts and Service [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 1,194.7 | 1,150.1 | 1,050.9 |
AN Reportable Segment, Import [Member] | Parts and Service [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 609.5 | 591.9 | 549.7 |
AN Reportable Segment, Import [Member] | Product and Service, Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 8.8 | 22.5 | 19.6 |
AN Reportable Segment, Import [Member] | Product and Service, Other [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 13.7 | 24.3 | 18.2 |
AN Reportable Segment, Premium Luxury [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 10,139.9 | 10,266.4 | 10,278.1 |
AN Reportable Segment, Premium Luxury [Member] | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 10,139.9 | 10,266.4 | 10,278.1 |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 8,286.3 | 8,316.0 | 8,259.3 |
Selling, general and administrative expenses: |  |  |  |  |
Compensation |  | 648.4 | 646.2 | 668.0 |
Advertising |  | 54.8 | 55.0 | 38.0 |
Store overhead |  | 306.5 | 281.9 | 253.9 |
Selling, General and Administrative Expense, Total |  | 1,009.7 | 983.1 | 959.9 |
Depreciation and amortization |  | 79.6 | 76.9 | 74.9 |
Floorplan interest expense |  | 88.7 | 53.9 | 15.0 |
Other income | [3] | (0.1) | 0.0 | (0.1) |
Franchise dealerships - segment income |  | 675.7 | 836.5 | 969.1 |
Finance income (loss) [Abstract] |  |  |  |  |
Capital Expenditures | [1] | 56.8 | 69.4 | 126.5 |
Segment assets |  | 3,829.9 | 3,506.8 | 2,996.8 |
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 5,201.1 | 5,246.4 | 4,872.3 |
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 4,816.8 | 4,759.6 | 4,239.5 |
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 2,837.0 | 2,979.5 | 3,499.8 |
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 2,685.2 | 2,803.3 | 3,311.6 |
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 1,667.4 | 1,593.1 | 1,448.6 |
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 784.2 | 752.1 | 705.3 |
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 0.3 | 1.2 | 3.6 |
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member] | Operating Segments |  |  |  |  |
Cost of Sales: |  |  |  |  |
Cost of sales |  | 0.1 | 1.0 | 2.9 |
AN Reportable Segment, AN Finance |  |  |  |  |
Finance income (loss) [Abstract] |  |  |  |  |
Interest and fee income |  | 118.4 | 84.0 | 20.6 |
Interest expense |  | (39.8) | (20.8) | (4.7) |
Provision for credit losses |  | (57.5) | (45.9) | (44.0) | [4]
Direct expenses | [5] | (37.8) | (39.3) | (9.5) |
Gain on sale of auto loans receivable |  | 7.4 | 8.1 | 0.0 |
AutoNation finance income (loss) |  | (9.3) | (13.9) | (37.6) |
AN Reportable Segment, AN Finance | Operating Segments |  |  |  |  |
Selling, general and administrative expenses: |  |  |  |  |
Depreciation and amortization |  | 0.0 | 0.0 | 0.0 |
Floorplan interest expense |  | 0.0 | 0.0 | 0.0 |
Finance income (loss) [Abstract] |  |  |  |  |
Interest and fee income |  | 118.4 | 84.0 | 20.6 |
Interest expense |  | (39.8) | (20.8) | (4.7) |
Provision for credit losses |  | (57.5) | (45.9) | (44.0) |
Direct expenses | [5] | (37.8) | (39.3) | (9.5) |
Gain on sale of auto loans receivable |  | 7.4 | 8.1 |  |
AutoNation finance income (loss) |  | (9.3) | (13.9) | (37.6) |
Capital Expenditures |  | 1.1 | 0.5 | 0.1 |
Segment assets |  | $ 1,118.3 | $ 430.5 | $ 337.8 |
[1] | (1) Includes accrued construction in progress and excludes property associated with leases entered during the year.
[2] | (2) “Corporate and other” assets include goodwill and franchise rights.
[3] | (2) Other income includes net gains on asset dispositions and legal settlements.
[4] | (1) Reflects activity that occurred after the acquisition of CIG Financial on October 1, 2022. Provision for credit losses includes initial credit loss expense of $34.2 million associated with the auto loans portfolio acquired as part of the acquisition.
[5] | (2) Direct expenses are comprised primarily of compensation expenses and loan administration costs incurred by our auto finance company.

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