CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Net product sales	$ 444.6	$ 412.6	$ 815.1	$ 781.6
Total revenues	444.6	412.6	815.1	781.6
Operating expenses:
Cost of product sales	18.9	20.0	33.2	20.7
Research and development	59.8	35.2	96.0	34.8
Selling, general and administrative	67.4	72.2	123.8	77.2
Estimated loss contingency	210.0		210.0
Total operating expenses	356.1	127.4	463.0	132.7
Operating income	88.5	285.2	352.1	648.9
Other (expense) income:
Interest expense	(1.4)	(0.6)	(2.2)	(1.2)
Other, net	3.6	1.1	4.4	1.9
Impairment of cost method investment	(46.5)		(46.5)
Total other (expense) income, net	(44.3)	0.5	(44.3)	0.7
Income before income taxes	44.2	285.7	307.8	649.6
Income tax expense	(100.2)	(79.6)	(185.2)	(208.0)
Net (loss) income	$ (56.0)	$ 206.1	$ 122.6	$ 441.6
Net (loss) income per common share:
Basic (in dollars per share)	$ (1.25)	$ 4.65	$ 2.74	$ 9.86
Diluted (in dollars per share)	$ (1.25)	$ 4.39	$ 2.68	$ 9.24
Weighted average number of common shares outstanding:
Basic (in shares)	44.9	44.3	44.7	44.8
Diluted (in shares)	44.9	46.9	45.7	47.8