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Revenues - Total Reserves for Discounts and Allowances (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]        
Revenue-related reserves for discounts and allowances $ 1,276.0 $ 1,198.9 $ 1,051.3 $ 761.6
Reduction of accounts receivable        
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]        
Revenue-related reserves for discounts and allowances 195.4 197.8    
Component of accrued expenses and other        
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]        
Revenue-related reserves for discounts and allowances $ 1,080.6 $ 1,001.1