Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total revenues	$ 1,444.6	$ 1,203.3	$ 2,889.4	$ 2,343.7
Costs and expenses:
Cost of sales (exclusive of amortization of purchased intangible assets)	144.9	99.2	256.6	185.0
Research and development	221.1	187.6	422.0	383.5
Selling, general and administrative	301.4	299.3	621.3	580.8
Acquired in-process research and development	0.0	(4.1)	0.0	(4.1)
Amortization of purchased intangible assets	73.7	80.1	147.4	160.1
Change in fair value of contingent consideration	15.8	6.1	21.6	(22.6)
Acquisition-related costs	4.6	0.0	42.7	0.0
Restructuring expenses	0.0	2.5	(0.8)	11.6
Impairment of intangible assets	2,053.3	0.0	2,053.3	0.0
Total costs and expenses	2,814.8	670.7	3,564.1	1,294.3
Operating (loss) income	(1,370.2)	532.6	(674.7)	1,049.4
Other income and expense:
Investment income (expense)	41.5	(14.9)	36.3	27.6
Interest expense	(23.6)	(18.3)	(49.4)	(38.2)
Other income and (expense)	0.2	0.1	(0.7)	2.5
(Loss) income before income taxes	(1,352.1)	499.5	(688.5)	1,041.3
Income tax (benefit) expense	(284.0)	39.7	(178.0)	(6.4)
Net (loss) income	$ (1,068.1)	$ 459.8	$ (510.5)	$ 1,047.7
Earnings (loss) per common share
Basic	$ (4.84)	$ 2.05	$ (2.31)	$ 4.68
Diluted	$ (4.84)	$ 2.04	$ (2.31)	$ 4.64
Shares used in computing earnings (loss) per common share
Basic	220.6	224.2	221.1	224.0
Diluted	220.6	225.6	221.1	225.7
Net Product Sales
Total revenues	$ 1,444.5	$ 1,202.5	$ 2,889.1	$ 2,342.7
Other Revenue
Total revenues	$ 0.1	$ 0.8	$ 0.3	$ 1.0