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Revenues - Reserves for Discounts and Allowances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance $ 1,198.9 $ 1,051.3 $ 761.6
Current provisions relating to sales in current year 4,102.5 3,698.6 3,389.1
Adjustments relating to prior years (53.7) (48.3) (12.1)
Payments/returns relating to sales in current year (3,061.2) (2,778.6) (2,440.4)
Payments/returns relating to sales in prior years (910.5) (724.1) (646.9)
Ending balance 1,276.0 1,198.9 1,051.3
Discounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance 131.1 127.8 109.6
Current provisions relating to sales in current year 774.7 666.2 679.3
Adjustments relating to prior years (1.0) 0.3 (0.3)
Payments/returns relating to sales in current year (635.1) (535.5) (551.7)
Payments/returns relating to sales in prior years (128.3) (127.7) (109.1)
Ending balance 141.4 131.1 127.8
Contractual Adjustments      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance 1,027.3 888.8 606.0
Current provisions relating to sales in current year 3,308.8 3,011.5 2,686.7
Adjustments relating to prior years (54.0) (54.1) (10.0)
Payments/returns relating to sales in current year (2,426.1) (2,242.9) (1,887.6)
Payments/returns relating to sales in prior years (763.0) (576.0) (506.3)
Ending balance 1,093.0 1,027.3 888.8
Returns      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance 40.5 34.7 46.0
Current provisions relating to sales in current year 19.0 20.9 23.1
Adjustments relating to prior years 1.3 5.5 (1.8)
Payments/returns relating to sales in current year 0.0 (0.2) (1.1)
Payments/returns relating to sales in prior years (19.2) (20.4) (31.5)
Ending balance $ 41.6 $ 40.5 $ 34.7