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Consolidated Statements of Operations - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Revenues $ 266.7 $ 184.6 $ 693.6 $ 497.5
Cost of sales 98.1 57.6 252.5 158.9
Gross profit 168.6 127.0 441.1 338.6
Operating expenses        
Research and development 50.1 43.3 142.1 136.7
Selling, general and administrative 104.6 84.2 320.7 256.4
Total operating expenses 154.7 127.5 462.8 393.1
Operating income (loss) 13.9 (0.5) (21.7) (54.5)
Income from equity investments 34.9 0.0 85.0 0.0
Other income (expense) (1.6) 1.3 (4.6) 3.5
Interest income 2.5 1.2 6.2 1.9
Interest expense (4.9) (4.5) (14.5) (8.1)
Income (loss) before income taxes 44.8 (2.5) 50.4 (57.2)
Income tax benefit (1.8) (0.5) (2.2) (16.4)
Net income (loss) $ 46.6 $ (2.0) $ 52.6 $ (40.8)
Basic net income (loss) per share $ 0.53 $ (0.02) $ 0.60 $ (0.47)
Shares used to compute basic net income (loss) per share 88.5 86.7 88.0 86.1
Diluted net income (loss) per share $ 0.52 $ (0.02) $ 0.59 $ (0.47)
Shares used to compute diluted net income (loss) per share 90.3 86.7 89.3 86.1