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STOCKHOLDERS' EQUITY Stockholders' Equity (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |
Common stock, shares outstanding (in shares) | 115.4 |  | 114.5 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 7,040.4 | $ 5,506.4 | $ 6,687.5 | $ 4,780.4
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 88.8 | 86.2 |  |
Adjustments Related to Tax Withholding for Share-based Compensation | (138.6) | (102.5) |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition | 76.1 | 57.5 |  |
Net income attributable to Intuitive Surgical, Inc. | 306.5 | 287.6 |  |
Other Comprehensive Income (Loss), Including Cumulative Effect of New Accounting Principle in Period of Adoption, Net of Tax | 12.6 | (1.3) |  |
Capital contribution from noncontrolling interest | 10.0 | 8.0 |  |
Less: net loss attributable to noncontrolling interest in joint venture | $ (2.5) | (0.3) |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | $ 390.8 |  |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares outstanding (in shares) | 115.4 | 113.3 | 114.5 | 112.3
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | 1.2 | 1.2 |  |
Shares withheld related to net share settlement of equity awards | (0.3) | (0.2) |  |
Additional Paid-in Capital [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 5,328.8 | $ 4,817.1 | 5,170.3 | 4,679.2
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 88.8 | 86.2 |  |
Adjustments Related to Tax Withholding for Share-based Compensation | (6.4) | (5.8) |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition | 76.1 | 57.5 |  |
Retained Earnings [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,696.0 | 698.0 | 1,521.7 | 115.0
Adjustments Related to Tax Withholding for Share-based Compensation | (132.2) | (96.7) |  |
Net income attributable to Intuitive Surgical, Inc. | 306.5 | 287.6 |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | 392.1 |  |
AOCI Attributable to Parent [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (0.7) | (18.1) | (13.3) | (15.5)
Other Comprehensive Income (Loss), Including Cumulative Effect of New Accounting Principle in Period of Adoption, Net of Tax | 12.6 | (1.3) |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | (1.3) |  |
Parent [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 7,024.2 | 5,497.1 | 6,678.8 | 4,778.8
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 88.8 | 86.2 |  |
Adjustments Related to Tax Withholding for Share-based Compensation | (138.6) | (102.5) |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition | 76.1 | 57.5 |  |
Net income attributable to Intuitive Surgical, Inc. | 306.5 | 287.6 |  |
Other Comprehensive Income (Loss), Including Cumulative Effect of New Accounting Principle in Period of Adoption, Net of Tax | 12.6 | (1.3) |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | 390.8 |  |
Noncontrolling Interest [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 16.2 | 9.3 | $ 8.7 | $ 1.6
Capital contribution from noncontrolling interest | 10.0 | 8.0 |  |
Less: net loss attributable to noncontrolling interest in joint venture | $ (2.5) | $ (0.3) |  |

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