Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Total revenues	$ 243.2	$ 220.2	$ 433.9	$ 338.0
Operating expenses:
Cost of product sales and contract manufacturing	100.8	85.3	192.7	139.4
Research and development	63.9	24.7	110.0	53.8
Selling, general and administrative	70.8	39.5	136.4	79.7
Amortization of acquisition-related intangible assets	14.7	3.9	29.2	7.8
Total operating expenses	250.2	153.4	468.3	280.7
(Loss) income from operations	(7.0)	66.8	(34.4)	57.3
Other income (expense):
Interest expense	(9.5)	(1.0)	(19.0)	(1.2)
Other income, net	1.4	0.0	0.4	0.3
Total other expense, net	(8.1)	(1.0)	(18.6)	(0.9)
(Loss) income before income taxes	(15.1)	65.8	(53.0)	56.4
Income tax (benefit) expense	(5.6)	15.7	(17.4)	11.2
Net (loss) income	$ (9.5)	$ 50.1	$ (35.6)	$ 45.2
Net (loss) income per common share
Basic (in dollars per share)	$ (0.18)	$ 1.00	$ (0.69)	$ 0.91
Diluted (in dollars per share)	$ (0.18)	$ 0.98	$ (0.69)	$ 0.89
Shares used in computing (loss) income per share
Basic (in shares)	51,500,000	49,900,000	51,300,000	49,700,000
Diluted (in shares)	51,500,000	51,200,000	51,300,000	51,000,000.0
Product sales, net
Revenues:
Total revenues	$ 183.5	$ 180.1	$ 336.5	$ 255.8
Contract manufacturing
Revenues:
Total revenues	18.7	23.6	34.6	49.8
Contracts and grants
Revenues:
Total revenues	$ 41.0	$ 16.5	$ 62.8	$ 32.4