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Acquisitions and Dispositions (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2018
franchise
Dec. 31, 2018
USD ($)
Dec. 31, 2018
dealership
Dec. 31, 2017
USD ($)
franchise
dealership
Dec. 31, 2016
franchise
Dec. 31, 2016
USD ($)
Dec. 31, 2016
dealership
Business Acquisition [Line Items]                
Number of franchises awarded   1            
Number of dealerships opened | dealership       1        
Aggregate consideration paid for dealerships | $     $ 140.4   $ 120.3   $ 61.2  
Cash received in acquisition | $         $ 11.2   3.9  
Number of dealerships disposed         3      
Number of franchises disposed           10    
Pretax gain on disposal | $     24.4          
Net pre-tax gain (loss) on dealership dispositions | $ $ 20.2              
U.K.                
Business Acquisition [Line Items]                
Number of dealerships acquired | dealership       5 12     12
Number of franchises acquired   8     14 15    
Number of franchises awarded   1     1 2    
Number of dealerships opened | dealership       1 1     2
Cash received in acquisition | $     $ 5.1          
Number of dealerships disposed | dealership         1      
Number of franchises disposed   1   1 1 1    
Number of franchises terminated   1            
Net pre-tax gain (loss) on dealership dispositions | $             (0.3)  
U.S.                
Business Acquisition [Line Items]                
Number of dealerships acquired | dealership       4 3      
Number of franchises acquired   4     4      
Number of franchises awarded   1     1      
Number of dealerships opened | dealership       1 1      
Number of dealerships disposed | dealership       2        
Number of franchises disposed   3       5    
Net pre-tax gain (loss) on dealership dispositions | $             2.7  
Brazil                
Business Acquisition [Line Items]                
Number of dealerships acquired       1   1   1
Number of franchises acquired   1       2    
Number of franchises awarded           2    
Number of dealerships opened | dealership               2
Number of dealerships disposed | dealership         2      
Number of franchises disposed         2 4    
Net pre-tax gain (loss) on dealership dispositions | $             $ (0.8)