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Multiemployer Pension Plans (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) store agreements | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Multiemployer Plans [Line Items] |  |  |  |
Total contributions | [1] | $ 1.9 | $ 1.7 | $ 1.6
Automotive Industries Pension Plan [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Surcharges paid |  | $ 0.8 | $ 0.6 | 0.6
Pension protection act zone status |  | Red | Red |
Total contributions | [1] | $ 1.6 | $ 1.4 | 1.3
Surcharge imposed | [2] | Yes |  |
Number of collective-bargaining arrangements that require contributions to the Plan | agreements |  | 3 |  |
Potential withdrawal obligation |  | $ 15.0 |  |
IAM National Pension Plan [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Pension protection act zone status |  | Red | Green |
Total contributions | [1] | $ 0.2 | $ 0.2 | 0.2
Surcharge imposed | [2] | Yes |  |
Potential withdrawal obligation |  | $ 4.0 |  |
Other funds [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Total contributions | [1] | $ 0.1 | $ 0.1 | $ 0.1
Collective Bargaining Agreement, Expiration Date, December 31, 2019 [Member] | Automotive Industries Pension Plan [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Number of collective-bargaining arrangements that require contributions to the Plan | agreements |  | 2 |  |
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 31, 2022 [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 |  | 231 |  |
Dealerships [Member] | Multiemployer Plans, Pension [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Number of stores | store |  | 5 |  |
[1] | Our stores were not listed in the Automotive Industries Pension Plan’s or IAM National Pension Fund’s Form 5500 as providing more than 5% of the total contributions for the plan years ended December 31, 2018 or 2017.
[2] | We paid surcharges to the Automotive Industries Pension Plan of $0.8 million, $0.6 million, and $0.6 million in 2019, 2018, and 2017 respectively. Surcharges to the IAM National Pension Fund commenced in 2019 and were de minimis.

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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 contributions made to multiemployer plan by employer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Indicate whether the employer paid a surcharge 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. The acceptable values are "no", "yes", and "NA". + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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