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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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