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Consolidated Statements Of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue:      
Product $ 2,547.1 $ 2,187.4 $ 1,919.6
Service 581.8 517.0 464.8
Total revenue 3,128.9 2,704.4 2,384.4
Cost of revenue:      
Product 754.9 663.3 647.2
Service 179.9 151.0 159.3
Total cost of revenue 934.8 814.3 806.5
Gross profit 2,194.1 1,890.1 1,577.9
Operating expenses:      
Selling, general and administrative 810.9 705.3 640.5
Research and development 328.6 239.6 197.4
Total operating expenses 1,139.5 944.9 837.9
Income from operations 1,054.6 945.2 740.0
Interest and other income, net 41.9 35.6 18.5
Income before taxes 1,096.5 980.8 758.5
Income tax expense 436.5 244.9 169.7
Net income $ 660.0 $ 735.9 $ 588.8
Net income per share:      
Basic (usd per share) $ 5.91 $ 6.40 $ 5.29
Diluted (usd per share) $ 5.67 $ 6.24 $ 5.18
Shares used in computing net income per share:      
Basic (shares) 111.7 114.9 111.3
Diluted (shares) 116.3 117.9 113.7