Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 311.8	$ 173.6	$ 745.7	$ 511.7
Operating expenses:
Cost of product sales and contract manufacturing	108.0	69.3	300.7	208.8
Research and development	53.4	37.0	163.4	90.8
Selling, general and administrative	65.0	42.1	201.3	121.8
Amortization of intangible assets	14.7	3.9	43.9	11.7
Total operating expenses	241.1	152.3	709.3	433.1
Income from operations	70.7	21.3	36.4	78.6
Other income (expense):
Interest expense	(10.3)	(0.6)	(29.3)	(1.8)
Other (expense) income, net	(1.5)	0.8	(1.2)	1.2
Total other income (expense), net	(11.8)	0.2	(30.5)	(0.6)
Income before income taxes	58.9	21.5	5.9	78.0
Income tax expense (benefit)	15.7	0.6	(1.7)	11.8
Net income	$ 43.2	$ 20.9	$ 7.6	$ 66.2
Net income per common share
Basic (in dollars per share)	$ 0.84	$ 0.42	$ 0.15	$ 1.33
Diluted (in dollars per share)	$ 0.83	$ 0.41	$ 0.15	$ 1.29
Shares used in computing income per share
Basic (in shares)	51.6	50.1	51.4	49.9
Diluted (in shares)	52.3	51.5	52.3	51.2
Product sales, net
Revenues:
Total revenues	$ 256.2	$ 133.3	$ 592.7	$ 389.1
Contract manufacturing
Revenues:
Total revenues	20.0	22.1	54.6	72.0
Contracts and grants
Revenues:
Total revenues	$ 35.6	$ 18.2	$ 98.4	$ 50.6