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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Net sales $ 4,386.3 $ 4,348.0 $ 3,722.8
Cost of sales 1,080.6 1,114.4 939.4
Gross profit 3,305.7 3,233.6 2,783.4
Selling, general, and administrative expenses 1,228.4 1,242.2 1,088.5
Research and development expenses 760.7 752.7 622.2
Intellectual property litigation expenses, net (Note 3) 405.4 33.4 214.0
Change in fair value of contingent consideration liabilities 13.6 (6.1) (5.7)
Special charges (Note 4) 0.0 64.6 116.2
Operating income 897.6 1,146.8 748.2
Interest expense 15.8 20.7 29.9
Interest income (23.4) (32.2) (32.0)
Special gain (Note 4) 0.0 0.0 (7.1)
Other income, net (Note 16) (11.5) (8.2) (4.0)
Income before provision for income taxes 916.7 1,166.5 761.4
Provision for income taxes (Note 17) 93.3 119.6 39.2
Net income $ 823.4 $ 1,046.9 $ 722.2
Earnings per share:      
Basic (in dollars per share) $ 1.32 $ 1.68 $ 1.15
Diluted (in dollars per share) $ 1.30 $ 1.64 $ 1.13
Weighted-average number of common shares outstanding:      
Basic (in shares) 622.6 624.8 627.6
Diluted (in shares) 631.9 636.7 640.9