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Operations and Summary of Significant Accounting Policies - Shipping and Handling Expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Selling, general and administrative expenses      
Accounting Policies [Line Items]      
Shipping Handling And Transportation Cost $ 38.0 $ 38.9 $ 37.9