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Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 280.5	$ 184.4
Cost of sales	111.7	65.5
Gross profit	168.8	118.9
Operating expenses:
Research and development	59.0	44.8
Selling, general and administrative	124.2	104.8
Total operating expenses	183.2	149.6
Operating loss	(14.4)	(30.7)
Interest expense	(14.9)	(4.8)
Income (loss) from equity investments	(4.2)	7.4
Interest and other income (expense), net	6.9	4.1
Loss before income taxes	(26.6)	(24.0)
Income tax expense	0.3	0.2
Net loss	$ (26.9)	$ (24.2)
Basic and diluted net loss per share	$ (0.30)	$ (0.28)
Shares used to compute basic and diluted net loss per share	90.3	87.3

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