Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 500.9	$ 396.3	$ 1,357.8	$ 1,013.2
Cost of sales	160.5	149.4	476.8	391.0
Gross profit	340.4	246.9	881.0	622.2
Operating expenses:
Research and development	87.7	66.7	240.7	194.7
Selling, general and administrative	158.6	124.2	444.8	386.7
Total operating expenses	246.3	190.9	685.5	581.4
Operating income	94.1	56.0	195.5	40.8
Interest expense	(24.4)	(15.1)	(60.1)	(45.0)
Loss on extinguishment of debt	(0.5)	0.0	(5.9)	0.0
Loss from equity investments	0.0	0.0	0.0	(4.2)
Interest and other income, net	5.9	4.9	14.2	18.3
Income before income taxes	75.1	45.8	143.7	9.9
Income tax expense	2.9	0.0	5.3	1.5
Net income	$ 72.2	$ 45.8	$ 138.4	$ 8.4
Basic net income per share (USD per share)	$ 0.75	$ 0.50	$ 1.48	$ 0.09
Shares used to compute basic net income per share (shares)	95.8	91.3	93.8	90.9
Diluted net income per share (USD per share)	$ 0.73	$ 0.50	$ 1.43	$ 0.09
Shares used to compute diluted net income per share (shares)	99.5	92.5	96.9	92.2

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227