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Multiemployer Pension Plans (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) store agreements | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Multiemployer Plans [Line Items] |  |  |
Contributions of AutoNation, insignificant plans | $ 0.1 | $ 0.1 | $ 0.1
Total Contributions | 1.5 | 1.7 | 1.9
Automotive Industries Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions of AutoNation, significant plans | $ 1.2 | 1.4 | 1.6
Surcharge imposed | Yes |  |
Surcharges paid | $ 0.5 | $ 0.6 | 0.8
Pension protection act zone status | Red | Red |
Number of collective-bargaining arrangements that require contributions to the Plan | agreements | 3 |  |
Potential withdrawal obligation | $ 16.0 |  |
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 |
Potential withdrawal obligation | $ 4.0 |  |
Collective Bargaining Agreement, Expiration Date, December 31, 2022 [Member] | Automotive Industries Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Number of collective-bargaining arrangements that require contributions to the Plan | agreements | 1 |  |
Collective Bargaining Agreement, Expiration Date, May 31, 2024 [Member] | Automotive Industries Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Number of collective-bargaining arrangements that require contributions to the Plan | agreements | 1 |  |
Collective Bargaining Agreement, Expiration Date, December 31, 2021 [Member] | Automotive Industries Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Number of collective-bargaining arrangements that require contributions to the Plan | agreements | 1 |  |
Collective Bargaining Agreement, Expiration Date, August 30, 2023 [Member] | IAM National Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Number of collective-bargaining arrangements that require contributions to the Plan | agreements | 2 |  |
Dealerships [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Number of stores | store | 247 |  |
Dealerships [Member] | Multiemployer Plans, Pension [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Number of stores | store | 5 |  |

X
- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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- Definition Indicates certified zone status of multiemployer pension plan determined to be individually significant. Acceptable values are "Green", "Yellow", "Orange", "Red", "Other", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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