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Multiemployer Pension Plans (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 store | Dec. 31, 2024 USD ($) numberOfAgreement store | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Multiemployer Plans [Line Items] |  |  |  |
Number of multiemployer plans in the red zone | store |  | 2 |  |
Number of stores divested | store | 1 |  |  |
Contributions of AutoNation, insignificant plans |  | $ 0.0 | $ 0.1 | $ 0.1
Total Contributions |  | 1.4 | 1.5 | 1.6
Automotive Industries Pension Plan [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Contributions of AutoNation, significant plans |  | $ 1.2 | 1.2 | 1.3
Surcharge imposed |  | Yes |  |
Surcharges paid |  | $ 0.6 | $ 0.6 | 0.6
Pension protection act zone status |  | Red | Red |
Number of collective-bargaining arrangements that require contributions to the Plan | numberOfAgreement |  | 3 |  |
Potential withdrawal obligation |  | $ 14.0 |  |
IAM National Pension Plan [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Contributions of AutoNation, significant plans |  | $ 0.2 | $ 0.2 | $ 0.2
Surcharge imposed |  | Yes |  |
Pension protection act zone status |  | Red | Red |
Number of collective-bargaining arrangements that require contributions to the Plan | numberOfAgreement |  | 1 |  |
Potential withdrawal obligation |  | $ 4.0 |  |
Dealerships [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Number of stores | store |  | 243 |  |
Dealerships [Member] | Multiemployer Plans, Pension [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Number of stores | store |  | 4 |  |

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- Definition Amount of surcharge paid by an employer to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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- Definition Amount of withdrawal liability that could be assessed in the event an entity ceases participating in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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- Definition Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480547/715-80-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 35 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480606/715-80-35-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480576/715-80-50-11 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480576/715-80-50-9 + Details
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