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AutoNation Finance Income (Loss) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AutoNation Finance Income [Line Items] |  |  |  |  |  |
Gain on sale of auto loans receivable |  |  | $ 7.4 | $ 8.1 | $ 0.0 |
AutoNation finance income (loss) |  |  | (9.3) | (13.9) | (37.6) |
Provision for credit losses on auto loans receivable |  |  | 54.7 | 45.9 | 43.8 |
Sold loans, allowance for expected credit losses |  |  | 11.7 | 16.1 |  |
Proceeds from the sale of auto loans receivable |  |  | 96.0 | 68.7 | 0.0 |
CIG Financial Acquisition |  |  |  |  |  |
AutoNation Finance Income [Line Items] |  |  |  |  |  |
Provision for credit losses on auto loans receivable |  | $ 34.2 |  |  |  |
AN Reportable Segment, AN Finance |  |  |  |  |  |
AutoNation Finance Income [Line Items] |  |  |  |  |  |
Interest and fee income |  |  | 118.4 | 84.0 | 20.6 |
Interest expense |  |  | (39.8) | (20.8) | (4.7) |
Total interest margin |  |  | 78.6 | 63.2 | 15.9 |
Provision for credit losses |  |  | (57.5) | (45.9) | (44.0) | [1]
Total interest margin after provision for loan losses |  |  | 21.1 | 17.3 | (28.1) |
Direct expenses | [2] |  | (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) |
Sold auto loans receivable, aggregate amortized cost |  |  | 88.6 | 60.6 |  |
Sold loans, allowance for expected credit losses |  |  | 11.7 | 16.1 |  |
Proceeds from the sale of auto loans receivable |  |  | $ 96.0 | $ 68.7 |  |
[1] | (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.
[2] | (2) Direct expenses are comprised primarily of compensation expenses and loan administration costs incurred by our auto finance company.

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- Definition Amount of decrease in allowance for credit loss on financing receivable from sale of loan. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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