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Description of Business and Summary of Significant Accounting Policies (Revenue Recognition, Advertising) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Advertising [Abstract]      
Advertising expense, net $ 161.7 $ 187.8 $ 197.8
Manufacturer advertising reimbursements $ 48.2 $ 59.8 $ 66.1