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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 4,348.0	$ 3,722.8	$ 3,435.3
Cost of sales	1,114.4	939.4	875.3
Gross profit	3,233.6	2,783.4	2,560.0
Selling, general, and administrative expenses	1,242.2	1,088.5	990.8
Research and development expenses	752.7	622.2	552.6
Intellectual property litigation expenses (income), net (Note 3)	33.4	214.0	(73.3)
Change in fair value of contingent consideration liabilities	(6.1)	(5.7)	(9.9)
Special charges, net (Note 4)	64.6	116.2	9.7
Other operating expenses	0.0	0.0	0.7
Operating income	1,146.8	748.2	1,089.4
Interest expense	20.7	29.9	23.2
Interest income	(32.2)	(32.0)	(20.3)
Special (gains) charges, net (Note 4)	0.0	(7.1)	50.2
Other (income) expense, net (Note 16)	(8.2)	(4.0)	1.4
Income before provision for income taxes	1,166.5	761.4	1,034.9
Provision for income taxes (Note 17)	119.6	39.2	451.3
Net income	$ 1,046.9	$ 722.2	$ 583.6
Earnings per share:
Basic (in dollars per share)	$ 5.03	$ 3.45	$ 2.77
Diluted (in dollars per share)	$ 4.93	$ 3.38	$ 2.70
Weighted-average number of common shares outstanding:
Basic (in shares)	208.3	209.2	210.9
Diluted (in shares)	212.2	213.6	215.9

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