CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Net product sales	$ 370.5	$ 369.0
Total revenues	370.5	369.0
Operating expenses:
Cost of product sales	14.3	0.7
Research and development	36.2	(0.4)
Selling, general and administrative	56.4	5.0
Total operating expenses	106.9	5.3
Operating income	263.6	363.7
Other income (expense):
Interest expense	(0.8)	(0.6)
Other, net	0.8	0.8
Total other income, net		0.2
Income before income taxes	263.6	363.9
Income tax expense	(85.0)	(128.4)
Net income	$ 178.6	$ 235.5
Net income per common share:
Basic (in dollars per share)	$ 4.01	$ 5.19
Diluted (in dollars per share)	$ 3.89	$ 4.84
Weighted average number of common shares outstanding:
Basic (in shares)	44.5	45.4
Diluted (in shares)	45.9	48.7