Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Total revenues	$ 677.7	$ 506.9
Operating expenses:
Cost of sales	72.9	52.3
Research and development	104.1	82.9
Selling, general, and administrative	144.4	87.3
Total operating expenses	321.4	222.5
Operating income	356.3	284.4
Interest income	53.8	29.2
Interest expense	(13.3)	(13.8)
Other income (expense), net	1.8	(7.9)
Total other income, net	42.3	7.5
Income before income taxes	398.6	291.9
Income tax expense	(92.0)	(51.0)
Net income	$ 306.6	$ 240.9
Net income per common share:
Basic (in dollars per share)	$ 6.52	$ 5.20
Diluted (in dollars per share)	$ 6.17	$ 4.86
Weighted average number of common shares outstanding:
Basic (in shares)	47.0	46.3
Diluted (in shares)	49.7	49.6