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Multiemployer Pension Plans (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
store
agreements
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Multiemployer Plans [Line Items]      
Number of stores | store 325    
Total contributions | $ [1] $ 1.7 $ 1.6 $ 1.5
Automotive Industries Pension Plan [Member]      
Multiemployer Plans [Line Items]      
EIN 941133245    
Multiemployer plan number 001    
Pension protection act zone status Red Red  
Total contributions | $ [1] $ 1.4 $ 1.3 1.1
Surcharge imposed Yes    
Number of collective-bargaining arrangements that require contributions to the Plan | agreements 3    
Other funds [Member]      
Multiemployer Plans [Line Items]      
Total contributions | $ [1] $ 0.3 $ 0.3 $ 0.4
Dealerships [Member]      
Multiemployer Plans [Line Items]      
Number of stores | store 239    
Dealerships [Member] | Multiemployer Plans, Pension [Member]      
Multiemployer Plans [Line Items]      
Number of stores | store 5    
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    
[1] Our stores were not listed in the Automotive Industries Pension Plan’s Form 5500 as providing more than 5% of the total contributions for the plan years ended December 31, 2017 or 2016.