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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total revenue | $ 1,128.2 | $ 920.9 | $ 3,200.8 | $ 2,677.7 |
Total cost of revenue | 342.6 | 278.6 | 986.6 | 809.3 |
Cost of revenue: |  |  |  |  |
Gross profit | 785.6 | 642.3 | 2,214.2 | 1,868.4 |
Operating expenses: |  |  |  |  |
Selling, general and administrative | 284.0 | 221.4 | 836.6 | 702.8 |
Research and development | 135.9 | 107.6 | 400.7 | 298.2 |
Total operating expenses | 419.9 | 329.0 | 1,237.3 | 1,001.0 |
Income from operations | 365.7 | 313.3 | 976.9 | 867.4 |
Interest and other income, net | 33.3 | 21.9 | 93.6 | 53.3 |
Income before taxes | 399.0 | 335.2 | 1,070.5 | 920.7 |
Income tax expense | 0.3 | 43.4 | 51.4 | 87.0 |
Net income attributable to Intuitive Surgical, Inc. | $ 396.8 | $ 292.5 | $ 1,021.6 | $ 835.4 |
Net income per share attributable to Intuitive Surgical, Inc.: |  |  |  |  |
Basic (in dollars per share) | $ 3.44 | $ 2.57 | $ 8.86 | $ 7.37 |
Diluted (in dollars per share) | $ 3.33 | $ 2.45 | $ 8.56 | $ 7.04 |
Total comprehensive income attributable to Intuitive Surgical, Inc. | $ 398.5 | $ 292.2 | $ 1,052.7 | $ 834.2 |
ASSETS |  |  |  |  |
Accounts receivable, net | 639.0 |  | 639.0 |  | $ 682.3
Prepaids and other current assets | 200.8 |  | 200.8 |  | 178.8
Deferred tax assets | 424.1 |  | 424.1 |  | 428.6
Intangible and other assets, net | 415.7 |  | 415.7 |  | 261.0
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |  |
Deferred revenue | 307.6 |  | 307.6 |  | 294.3
Other accrued liabilities | 303.5 |  | 303.5 |  | 231.8
Retained earnings | 2,142.6 |  | 2,142.6 |  | $ 1,521.7
Product |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total revenue | 944.8 | 760.9 | 2,666.9 | 2,209.2 |
Total cost of revenue | 277.3 | 225.1 | 807.1 | 654.7 |
Service |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total revenue | 183.4 | 160.0 | 533.9 | 468.5 |
Total cost of revenue | $ 65.3 | $ 53.5 | $ 179.5 | $ 154.6 |

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