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Consolidated Statements of Operations - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues $ 242.5 $ 170.6 $ 426.9 $ 312.9
Cost of sales 88.9 53.1 154.4 101.3
Gross profit 153.6 117.5 272.5 211.6
Operating expenses        
Research and development 47.2 45.3 92.0 93.4
Selling, general and administrative 111.3 85.8 216.1 172.2
Total operating expenses 158.5 131.1 308.1 265.6
Operating loss (4.9) (13.6) (35.6) (54.0)
Income from equity investments 42.7 0.0 50.1 0.0
Other income (expense) (5.6) 1.8 (3.0) 2.2
Interest income 2.2 0.5 3.7 0.7
Interest expense (4.8) (3.1) (9.6) (3.6)
Income (loss) before income taxes 29.6 (14.4) 5.6 (54.7)
Income tax benefit (0.6) (17.3) (0.4) (15.9)
Net income (loss) $ 30.2 $ 2.9 $ 6.0 $ (38.8)
Basic net income (loss) per share $ 0.34 $ 0.03 $ 0.07 $ (0.45)
Shares used to compute basic net income (loss) per share 88.2 86.4 87.7 85.8
Diluted net income (loss) per share $ 0.34 $ 0.03 $ 0.07 $ (0.45)
Shares used to compute diluted net income (loss) per share 89.4 87.4 88.8 85.8