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Net Income Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Computation Of Basic And Diluted Net Income Per Share
The following table presents the computation of basic and diluted net income per share attributable to Intuitive Surgical, Inc. (in millions, except per share amounts):
 Years Ended December 31,
 202020192018
Numerator:
Net income attributable to Intuitive Surgical, Inc.$1,060.6 $1,379.3 $1,127.9 
Denominator:
Weighted average shares outstanding used in basic calculation117.0 115.4 113.7 
Add: dilutive effect of potential common shares3.3 4.1 5.1 
Weighted average shares outstanding used in diluted calculation120.3 119.5 118.8 
Net income per share attributable to Intuitive Surgical, Inc.:
Basic$9.06 $11.95 $9.92 
Diluted$8.82 $11.54 $9.49