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Acquisitions - Summary of Acquisitions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Cash paid, net of cash acquired $ 373.8 $ 460.4 $ 234.7
Equity securities issued 0.0 2.1 0.0
Debt issued 125.1 1.8  
Total 498.9 464.3  
Goodwill 434.9 256.3 $ 259.4
Acquisitions 2018      
Business Acquisition [Line Items]      
Trade receivables, net 0.7    
Inventories 180.0    
Franchise value 29.8    
Property and equipment 179.7    
Other assets 48.6    
Floor plan notes payable (10.8)    
Debt and capital lease obligations 0.0    
Deferred taxes, net 0.0    
Other liabilities (2.3)    
Assets acquired and liabilities assumed, excluding goodwill 425.7    
Goodwill 73.2    
Assets acquired and liabilities assumed, net $ 498.9    
Acquisitions 2017      
Business Acquisition [Line Items]      
Trade receivables, net   46.9  
Inventories   189.8  
Franchise value   73.7  
Property and equipment   166.0  
Other assets   18.3  
Floor plan notes payable   (72.5)  
Debt and capital lease obligations   (38.7)  
Deferred taxes, net   (2.0)  
Other liabilities   (24.7)  
Assets acquired and liabilities assumed, excluding goodwill   356.8  
Goodwill   107.5  
Assets acquired and liabilities assumed, net   $ 464.3