Condensed Consolidated Statements of Operations And Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenues	$ 237.1	$ 138.4
Operating expenses:
Cost of sales	2.1	1.1
Research and development	58.3	37.7
Acquired in-process research and development		113.1
Selling, general and administrative	117.8	87.5
Total operating expenses	178.2	239.4
Operating income (loss)	58.9	(101.0)
Other (expense) income:
Interest expense	(8.2)	(7.9)
Unrealized losses (gains) on equity securities	(16.5)	1.7
Investment income and other, net	4.7	4.6
Total other expense, net	(20.0)	(1.6)
Income (loss) before provision for (benefit from) income taxes	38.9	(102.6)
Provision for (benefit from) income taxes	1.5	(0.5)
Net income (loss)	37.4	(102.1)
Unrealized (loss) gain on debt securities available-for-sale, net of tax	(2.8)	1.7
Comprehensive income (loss)	$ 34.6	$ (100.4)
Net income (loss) per share, basic	$ 0.40	$ (1.12)
Net income (loss) per share, diluted	$ 0.39	$ (1.12)
Weighted average common shares outstanding, basic	92.6	91.1
Weighted average common shares outstanding, diluted	97.0	91.1
Product sales, net
Revenues:
Revenues	$ 231.1	$ 136.4
Collaboration revenue
Revenues:
Revenues	$ 6.0	$ 2.0