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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Net sales $ 1,216.6 $ 1,128.7
Cost of sales 293.4 265.1
Gross profit 923.2 863.6
Selling, general, and administrative expenses 330.8 307.8
Research and development expenses 207.0 187.4
Intellectual property litigation expenses 6.4 12.5
Change in fair value of contingent consideration liabilities (Note 4) (4.5) (2.2)
Operating income 383.5 358.1
Interest income, net (0.3) (4.5)
Other income, net (5.5) (1.9)
Income before provision for income taxes 389.3 364.5
Provision for income taxes 51.1 53.9
Net income $ 338.2 $ 310.6
Earnings per share:    
Basic (in dollars per share) $ 0.54 $ 0.50
Diluted (in dollars per share) $ 0.54 $ 0.49
Weighted-average number of common shares outstanding:    
Basic (in shares) 623.2 624.6
Diluted (in shares) 631.3 635.1