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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			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2015	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	$ 1,098.9	$ 909.3		$ 2,072.6	$ 1,756.8
Total cost of revenue	339.9	277.0		644.0	530.7
Cost of revenue:
Gross profit	759.0	632.3		1,428.6	1,226.1
Operating expenses:
Selling, general and administrative	279.2	259.8		552.6	481.4
Research and development	120.8	95.1		264.8	190.6
Total operating expenses	400.0	354.9		817.4	672.0
Income from operations	359.0	277.4		611.2	554.1
Interest and other income, net	32.8	18.2		60.3	31.4
Income before taxes	391.8	295.6		671.5	585.5
Income tax expense	75.4	41.0	$ 29.3	51.1	43.6
Net income attributable to Intuitive Surgical, Inc.	$ 318.3	$ 255.3		$ 624.8	$ 542.9
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)	$ 2.76	$ 2.25		$ 5.42	$ 4.80
Diluted (in dollars per share)	$ 2.67	$ 2.15		$ 5.23	$ 4.59
Total comprehensive income attributable to Intuitive Surgical, Inc.	$ 335.1	$ 257.0		$ 654.2	$ 542.0
ASSETS
Accounts receivable, net	633.4			633.4		$ 682.3
Prepaids and other current assets	207.0			207.0		178.8
Deferred tax assets	369.1			369.1		428.6
Intangible and other assets, net	383.8			383.8		261.0
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue	306.8			306.8		294.3
Other accrued liabilities	210.6			210.6		231.8
Retained earnings	1,819.0			1,819.0		$ 1,521.7
Product
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	922.3	753.5		1,722.1	1,448.3
Total cost of revenue	283.4	228.1		529.8	429.6
Service
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	176.6	155.8		350.5	308.5
Total cost of revenue	$ 56.5	$ 48.9		$ 114.2	$ 101.1

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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