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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue:    
Total revenue $ 973.7 $ 847.5
Cost of revenue:    
Total cost of revenue 304.1 253.7
Gross profit 669.6 593.8
Operating expenses:    
Selling, general and administrative 273.4 221.6
Research and development 144.0 95.5
Total operating expenses 417.4 317.1
Income from operations 252.2 276.7
Interest and other income, net 27.5 13.2
Income before taxes 279.7 289.9
Income tax expense (benefit) (24.3) 2.6
Net income 304.0 287.3
Less: net loss attributable to noncontrolling interest in joint venture (2.5) (0.3)
Net income attributable to Intuitive Surgical, Inc. $ 306.5 $ 287.6
Net income per share attributable to Intuitive Surgical, Inc.:    
Basic (in dollars per share) $ 2.67 $ 2.55
Diluted (in dollars per share) $ 2.56 $ 2.44
Shares used in computing net income per share attributable to Intuitive Surgical, Inc.:    
Basic (in shares) 115.0 112.8
Diluted (in shares) 119.6 118.0
Total comprehensive income attributable to Intuitive Surgical, Inc. $ 319.1 $ 285.0
Product    
Revenue:    
Total revenue 799.8 694.8
Cost of revenue:    
Total cost of revenue 246.4 201.5
Service    
Revenue:    
Total revenue 173.9 152.7
Cost of revenue:    
Total cost of revenue $ 57.7 $ 52.2