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Revenue (Adjustments to Revenue) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
U.S. | Sales returns, rebates, and discounts        
Change in Accounting Estimate [Line Items]        
Revenue, information used to determine revenue recognized, change in accounting estimate, percent (less than - 2021) 1.00% (1.00%) 1.00% 1.00%