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STOCKHOLDERS' EQUITY - Schedule of Stockholders Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)			114.5
Beginning balance	$ 7,040.4	$ 5,506.4	$ 6,687.5	$ 4,780.4
Adoption of new accounting standards					$ 390.8
Issuance of common stock through employee stock plans	30.8	48.7	119.6	134.9
Shares withheld related to net share settlement of equity awards	(6.4)	(5.5)	(145.0)	(108.0)
Share-based compensation expense related to employee stock plans	81.6	63.3	157.7	120.8
Repurchase and retirement of common stock	(200.0)		(200.0)
Net income attributable to Intuitive Surgical, Inc.	318.3	255.3	624.8	542.9
Other comprehensive income	16.8	1.7	29.4	0.4
Capital contribution from noncontrolling interest			10.0	8.0
Less: net loss attributable to noncontrolling interest in joint venture	$ (1.9)	(0.7)	$ (4.4)	(1.0)
Ending balance (in shares)	115.2		115.2
Ending balance	$ 7,279.6	$ 5,869.2	$ 7,279.6	$ 5,869.2
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	115.4	113.3	114.5	112.3
Beginning balance	$ 0.1	$ 0.1	$ 0.1	$ 0.1
Issuance of common stock through employee stock plans (in shares)	0.2	0.5	1.4	1.7
Shares withheld related to net share settlement of equity awards	0.0	(0.1)	0.3	0.3
Repurchase and retirement of common stock (in shares)	(0.4)		0.4
Ending balance (in shares)	115.2	113.7	115.2	113.7
Ending balance	$ 0.1	$ 0.1	$ 0.1	$ 0.1
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	5,328.8	4,817.1	5,170.3	4,679.2
Issuance of common stock through employee stock plans	30.8	48.7	119.6	134.9
Shares withheld related to net share settlement of equity awards	(0.3)	(0.3)	(6.7)	(6.1)
Share-based compensation expense related to employee stock plans	81.6	63.3	157.7	120.8
Repurchase and retirement of common stock	(10.8)		(10.8)
Ending balance	5,430.1	4,928.8	5,430.1	4,928.8
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,696.0	698.0	1,521.7	115.0
Adoption of new accounting standards					392.1
Shares withheld related to net share settlement of equity awards	(6.1)	(5.2)	(138.3)	(101.9)
Repurchase and retirement of common stock	(189.2)		(189.2)
Net income attributable to Intuitive Surgical, Inc.	318.3	255.3	624.8	542.9
Ending balance	1,819.0	948.1	1,819.0	948.1
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(0.7)	(18.1)	(13.3)	(15.5)
Adoption of new accounting standards					(1.3)
Other comprehensive income	16.8	1.7	29.4	0.4
Ending balance	16.1	(16.4)	16.1	(16.4)
Total Intuitive Surgical, Inc. Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	7,024.2	5,497.1	6,678.8	4,778.8
Adoption of new accounting standards					$ 390.8
Issuance of common stock through employee stock plans	30.8	48.7	119.6	134.9
Shares withheld related to net share settlement of equity awards	(6.4)	(5.5)	(145.0)	(108.0)
Share-based compensation expense related to employee stock plans	81.6	63.3	157.7	120.8
Repurchase and retirement of common stock	(200.0)		(200.0)
Net income attributable to Intuitive Surgical, Inc.	318.3	255.3	624.8	542.9
Other comprehensive income	16.8	1.7	29.4	0.4
Ending balance	7,265.3	5,860.6	7,265.3	5,860.6
Noncontrolling Interest in Joint Venture
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	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	(1.9)	(0.7)	(4.4)	(1.0)
Ending balance	$ 14.3	$ 8.6	$ 14.3	$ 8.6

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