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
Revenues:
Total revenues	$ 394.7	$ 243.2	$ 587.2	$ 433.9
Operating expenses:
Cost of product sales and contract development and manufacturing services	129.8	100.8	206.7	192.7
Research and development	47.9	63.9	90.6	110.0
Selling, general and administrative	76.0	70.8	145.7	136.4
Amortization of intangible assets	15.0	14.7	29.8	29.2
Total operating expenses	268.7	250.2	472.8	468.3
Income (loss) from operations	126.0	(7.0)	114.4	(34.4)
Other income (expense):
Interest expense	(6.4)	(9.5)	(15.0)	(19.0)
Other, net	1.1	1.4	0.0	0.4
Total other income (expense), net	(5.3)	(8.1)	(15.0)	(18.6)
Income (loss) before provision for income taxes	120.7	(15.1)	99.4	(53.0)
Income tax provision (benefit)	28.0	(5.6)	19.2	(17.4)
Net income (loss)	$ 92.7	$ (9.5)	$ 80.2	$ (35.6)
Net income (loss) per common share
Basic (in dollars per share)	$ 1.76	$ (0.18)	$ 1.53	$ (0.69)
Diluted (in dollars per share)	$ 1.73	$ (0.18)	$ 1.51	$ (0.69)
Shares used in computing income (loss) per share
Basic (in shares)	52.6	51.5	52.3	51.3
Diluted (in shares)	53.5	51.5	53.2	51.3
Product sales, net
Revenues:
Total revenues	$ 298.5	$ 183.5	$ 446.7	$ 336.5
Contract development and manufacturing services
Revenues:
Total revenues	72.6	18.7	94.3	34.6
Contracts and grants
Revenues:
Total revenues	$ 23.6	$ 41.0	$ 46.2	$ 62.8