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Consolidated Statements of Operations - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Revenues $ 396.3 $ 266.7 $ 1,013.2 $ 693.6
Cost of sales 149.4 98.1 391.0 252.5
Gross profit 246.9 168.6 622.2 441.1
Operating expenses:        
Research and development 66.7 50.1 194.7 142.1
Selling, general and administrative 124.2 104.6 386.7 320.7
Total operating expenses 190.9 154.7 581.4 462.8
Operating income (loss) 56.0 13.9 40.8 (21.7)
Interest expense (15.1) (4.9) (45.0) (14.5)
Income (loss) from equity investments 0.0 34.9 (4.2) 85.0
Interest and other income, net 4.9 0.9 18.3 1.6
Income before income taxes 45.8 44.8 9.9 50.4
Income tax expense (benefit) 0.0 (1.8) 1.5 (2.2)
Net income $ 45.8 $ 46.6 $ 8.4 $ 52.6
Basic net income per share $ 0.50 $ 0.53 $ 0.09 $ 0.60
Shares used to compute basic net income per share 91.3 88.5 90.9 88.0
Diluted net income per share $ 0.50 $ 0.52 $ 0.09 $ 0.59
Shares used to compute diluted net income per share 92.5 90.3 92.2 89.3