Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Total revenues	$ 609.4	$ 516.0	$ 1,712.8	$ 1,444.8
Operating expenses:
Cost of sales	70.1	37.2	186.5	92.8
Research and development	84.7	66.1	256.6	229.0
Selling, general, and administrative	127.6	98.4	344.9	318.9
Total operating expenses	282.4	201.7	788.0	640.7
Operating income	327.0	314.3	924.8	804.1
Interest income	45.3	13.3	111.7	24.4
Interest expense	(15.6)	(9.2)	(44.2)	(20.1)
Other expense, net	(4.9)	(5.9)	(13.4)	(34.9)
Impairment of investment in privately-held company	0.0	0.0	0.0	(1.7)
Total other income (expense), net	24.8	(1.8)	54.1	(32.3)
Income before income taxes	351.8	312.5	978.9	771.8
Income tax expense	(84.2)	(73.2)	(211.2)	(176.6)
Net income	$ 267.6	$ 239.3	$ 767.7	$ 595.2
Net income per common share:
Basic (in dollars per share)	$ 5.71	$ 5.26	$ 16.44	$ 13.14
Diluted (in dollars per share)	$ 5.38	$ 4.91	$ 15.48	$ 12.35
Weighted average number of common shares outstanding:
Basic (in shares)	46.9	45.5	46.7	45.3
Diluted (in shares)	49.7	48.7	49.6	48.2