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Summary of Significant Accounting Policies - Advertising Expense and Manufacturing Cooperative Advertising Credits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Advertising expense, gross $ 134.2 $ 116.1 $ 101.7
Manufacturer cooperative advertising credits (25.5) (22.8) (20.3)
Advertising expense, net $ 108.7 $ 93.3 $ 81.4