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Summary Of Significant Accounting Policies - Schedule of Impact of Adopting New Standard (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:                      
Total revenue $ 1,046.5 $ 920.9 $ 909.3 $ 847.5 $ 892.0 $ 807.8 $ 758.8 $ 679.6 $ 3,724.2 $ 3,138.2 $ 2,706.5
Cost of revenue:                      
Total cost of revenue                 1,120.1 936.2 813.6
Gross profit 735.7 642.3 632.3 593.8 634.0 568.1 530.1 469.8 2,604.1 2,202.0 1,892.9
Operating expenses:                      
Selling, general and administrative                 986.6 810.5 703.6
Research and development                 418.1 328.6 239.6
Total operating expenses                 1,404.7 1,139.1 943.2
Income from operations                 1,199.4 1,062.9 949.7
Interest and other income, net                 80.1 41.9 35.6
Income before taxes                 1,279.5 1,104.8 985.3
Income tax expense                 154.5 433.9 247.0
Net income attributable to Intuitive Surgical, Inc. $ 292.5 $ 292.5 $ 255.3 $ 287.6 $ (31.5) $ 298.6 $ 223.0 $ 180.8 $ 1,127.9 $ 670.9 $ 738.3
Net income per share attributable to Intuitive Surgical, Inc.:                      
Basic (usd per share) $ 2.56 $ 2.57 $ 2.25 $ 2.55 $ (0.28) $ 2.67 $ 2.01 $ 1.62 $ 9.92 $ 6.01 $ 6.43
Diluted (usd per share) $ 2.45 $ 2.45 $ 2.15 $ 2.44 $ (0.28) $ 2.56 $ 1.94 $ 1.57 $ 9.49 $ 5.77 $ 6.26
Total comprehensive income attributable to Intuitive Surgical, Inc.                 $ 1,130.1 $ 664.3 $ 738.9
ASSETS                      
Accounts receivable, net $ 682.3       $ 507.9       682.3 507.9  
Prepaids and other current assets 178.8       99.2       178.8 99.2  
Deferred tax assets 428.6       72.0       428.6 72.0  
Intangible and other assets, net 261.0       195.8       261.0 195.8  
LIABILITIES AND STOCKHOLDERS’ EQUITY                      
Deferred revenue 294.3       243.8       294.3 243.8  
Other accrued liabilities 231.8       168.9       231.8 168.9  
Retained earnings $ 1,521.7       115.0       1,521.7 115.0  
Product                      
Revenue:                      
Total revenue                 3,089.1 2,565.3 2,195.8
Cost of revenue:                      
Total cost of revenue                 906.2 756.3 662.6
Service                      
Revenue:                      
Total revenue                 635.1 572.9 510.7
Cost of revenue:                      
Total cost of revenue                 $ 213.9 179.9 151.0
ASC 606                      
Revenue:                      
Total revenue                   3,138.2 2,706.5
Cost of revenue:                      
Total cost of revenue                   936.2 813.6
Gross profit                   2,202.0 1,892.9
Operating expenses:                      
Selling, general and administrative                   810.5 703.6
Research and development                   328.6 239.6
Total operating expenses                   1,139.1 943.2
Income from operations                   1,062.9 949.7
Interest and other income, net                   41.9 35.6
Income before taxes                   1,104.8 985.3
Income tax expense                   433.9 247.0
Net income attributable to Intuitive Surgical, Inc.                   $ 670.9 $ 738.3
Net income per share attributable to Intuitive Surgical, Inc.:                      
Basic (usd per share)                   $ 6.01 $ 6.43
Diluted (usd per share)                   $ 5.77 $ 6.26
Total comprehensive income attributable to Intuitive Surgical, Inc.                   $ 664.3 $ 738.9
ASSETS                      
Accounts receivable, net         507.9         507.9  
Prepaids and other current assets         99.2         99.2  
Deferred tax assets         72.0         72.0  
Intangible and other assets, net         195.8         195.8  
LIABILITIES AND STOCKHOLDERS’ EQUITY                      
Deferred revenue         243.8         243.8  
Other accrued liabilities         168.9         168.9  
Other Liabilities, Noncurrent         333.6         333.6  
Retained earnings         115.0         115.0  
ASC 606 | Product                      
Revenue:                      
Total revenue                   2,565.3 2,195.8
Cost of revenue:                      
Total cost of revenue                   756.3 662.6
ASC 606 | Service                      
Revenue:                      
Total revenue                   572.9 510.7
Cost of revenue:                      
Total cost of revenue                   179.9 151.0
As Previously Reported | ASC 606                      
Revenue:                      
Total revenue                   3,128.9 2,704.4
Cost of revenue:                      
Total cost of revenue                   934.8 814.3
Gross profit                   2,194.1 1,890.1
Operating expenses:                      
Selling, general and administrative                   810.9 705.3
Research and development                   328.6 239.6
Total operating expenses                   1,139.5 944.9
Income from operations                   1,054.6 945.2
Interest and other income, net                   41.9 35.6
Income before taxes                   1,096.5 980.8
Income tax expense                   436.5 244.9
Net income attributable to Intuitive Surgical, Inc.                   $ 660.0 $ 735.9
Net income per share attributable to Intuitive Surgical, Inc.:                      
Basic (usd per share)                   $ 5.91 $ 6.40
Diluted (usd per share)                   $ 5.67 $ 6.24
Total comprehensive income attributable to Intuitive Surgical, Inc.                   $ 653.4 $ 736.5
ASSETS                      
Accounts receivable, net         511.9         511.9  
Prepaids and other current assets         97.2         97.2  
Deferred tax assets         87.3         87.3  
Intangible and other assets, net         159.7         159.7  
LIABILITIES AND STOCKHOLDERS’ EQUITY                      
Deferred revenue         284.5         284.5  
Other accrued liabilities         169.5         169.5  
Other Liabilities, Noncurrent         327.1         327.1  
Retained earnings         61.4         61.4  
As Previously Reported | ASC 606 | Product                      
Revenue:                      
Total revenue                   2,547.1 2,187.4
Cost of revenue:                      
Total cost of revenue                   754.9 663.3
As Previously Reported | ASC 606 | Service                      
Revenue:                      
Total revenue                   581.8 517.0
Cost of revenue:                      
Total cost of revenue                   179.9 151.0
Adjustments | ASC 606                      
Revenue:                      
Total revenue                   9.3 2.1
Cost of revenue:                      
Total cost of revenue                   1.4 (0.7)
Gross profit                   7.9 2.8
Operating expenses:                      
Selling, general and administrative                   (0.4) (1.7)
Research and development                   0.0 0.0
Total operating expenses                   (0.4) (1.7)
Income from operations                   8.3 4.5
Interest and other income, net                   0.0 0.0
Income before taxes                   8.3 4.5
Income tax expense                   (2.6) 2.1
Net income attributable to Intuitive Surgical, Inc.                   $ 10.9 $ 2.4
Net income per share attributable to Intuitive Surgical, Inc.:                      
Basic (usd per share)                   $ 0.10 $ 0.03
Diluted (usd per share)                   $ 0.10 $ 0.02
Total comprehensive income attributable to Intuitive Surgical, Inc.                   $ 10.9 $ 2.4
ASSETS                      
Accounts receivable, net         (4.0)         (4.0)  
Prepaids and other current assets         2.0         2.0  
Deferred tax assets         (15.3)         (15.3)  
Intangible and other assets, net         36.1         36.1  
LIABILITIES AND STOCKHOLDERS’ EQUITY                      
Deferred revenue         (40.7)         (40.7)  
Other accrued liabilities         (0.6)         (0.6)  
Other Liabilities, Noncurrent         6.5         6.5  
Retained earnings         $ 53.6         53.6  
Adjustments | ASC 606 | Product                      
Revenue:                      
Total revenue                   18.2 8.4
Cost of revenue:                      
Total cost of revenue                   1.4 (0.7)
Adjustments | ASC 606 | Service                      
Revenue:                      
Total revenue                   (8.9) (6.3)
Cost of revenue:                      
Total cost of revenue                   $ 0.0 $ 0.0