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Acquisitions and Dispositions (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2019
franchise
Dec. 31, 2019
USD ($)
Dec. 31, 2019
dealership
Dec. 31, 2018
USD ($)
franchise
dealership
Dec. 31, 2017
USD ($)
franchise
dealership
Business Acquisition [Line Items]                
Aggregate consideration paid for dealerships | $         $ 143.2   $ 140.4 $ 120.3
Cash received in acquisition | $             5.1 $ 11.2
Net pre-tax gain (loss) on dealership dispositions | $ $ (0.3) $ 5.4 $ 20.1   $ 5.0   $ 24.4  
U.S.                
Business Acquisition [Line Items]                
Number of dealerships acquired | dealership           4 4 3
Number of franchises acquired       6     4  
Number of dealerships opened | dealership           1 1  
Number of franchises awarded       1     1 1
Number of dealerships disposed | dealership           4 2  
Number of franchises disposed       7     3  
Number of franchises terminated       2     1  
Net pre-tax gain (loss) on dealership dispositions | $             $ 25.2  
U.K.                
Business Acquisition [Line Items]                
Number of dealerships acquired | dealership           4 5 12
Number of franchises acquired       5     8 14
Number of dealerships opened | dealership           2 1 1
Number of franchises awarded       3     1 1
Number of franchises added             1  
Number of dealerships disposed | dealership             1 1
Number of franchises disposed       4   3 1 1
Brazil                
Business Acquisition [Line Items]                
Number of dealerships acquired | dealership             1  
Number of franchises acquired             1  
Number of dealerships opened | dealership             1 1
Number of franchises awarded             1  
Number of dealerships disposed | dealership           1   2
Number of franchises disposed       1       2