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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 617.3 $ 593.0 $ 454.6
2021 Acquisitions      
Business Acquisition [Line Items]      
Accounts receivable 0.7    
Inventories, net 439.3    
Property and equipment, net 86.0    
Other non-current assets 1,443.9    
Floor plan notes payable (4.0)    
Borrowings on lines-of-credit (225.6)    
Other long-term liabilities (6.0)    
 Assets acquired and liabilities assumed 1,734.3    
Goodwill 7.6    
Assets acquired and liabilities assumed, net $ 1,741.9