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Acquisitions - Summary of Acquisitions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 977.3 $ 593.0 $ 454.6
2021 Acquisitions      
Business Acquisition [Line Items]      
Cash paid, net of cash acquired 2,697.5    
Contingent consideration 0.0    
Preliminary fair value of redeemable non-controlling interest 33.1    
Debt and finance lease obligations 356.0    
Total consideration paid 3,086.6    
Trade receivables, net 1.3    
Inventories 626.2    
Property and equipment 767.5    
Other assets 1,726.2    
Floor plan notes payable (4.0)    
Other liabilities (30.6)    
Assets acquired and liabilities assumed, excluding goodwill 3,086.6    
Goodwill 0.0    
Total net assets acquired and liabilities assumed $ 3,086.6    
2020 Acquisitions      
Business Acquisition [Line Items]      
Cash paid, net of cash acquired   1,503.1  
Contingent consideration   4.6  
Preliminary fair value of redeemable non-controlling interest   0.0  
Debt and finance lease obligations   218.9  
Total consideration paid   1,726.6  
Trade receivables, net   0.2  
Inventories   358.9  
Property and equipment   529.9  
Other assets   858.4  
Floor plan notes payable   (13.1)  
Other liabilities   (8.5)  
Assets acquired and liabilities assumed, excluding goodwill   1,725.8  
Goodwill   0.8  
Total net assets acquired and liabilities assumed   $ 1,726.6