Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Operating activities:
Net income	$ 703.7	$ 547.4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and loss on disposal of property, plant, and equipment	137.5	104.2
Amortization of intangible assets	3.4	5.1
Gain on investments, accretion of discounts, and amortization of premiums on investments, net	(17.7)	(5.9)
Deferred income taxes	0.1	(7.2)
Share-based compensation expense	185.2	153.3
Amortization of contract acquisition assets	8.7	8.5
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	3.6	2.2
Inventory	(211.1)	(179.6)
Prepaids and other assets	(7.8)	(4.1)
Accounts payable	83.1	(7.5)
Accrued compensation and employee benefits	(226.0)	(271.2)
Deferred revenue	37.0	(4.0)
Other liabilities	(118.1)	(75.8)
Net cash provided by operating activities	581.6	265.4
Investing activities:
Purchase of investments	(519.8)	(905.9)
Proceeds from sales of investments	0.0	100.2
Proceeds from maturities of investments	849.9	919.1
Purchase of property, plant, and equipment	(116.6)	(241.9)
Net cash provided by (used in) investing activities	213.5	(128.5)
Financing activities:
Proceeds from issuance of common stock relating to employee stock plans	134.3	180.4
Taxes paid related to net share settlement of equity awards	(370.1)	(226.6)
Payment of deferred purchase consideration	0.0	(0.5)
Net cash used in financing activities	(235.8)	(46.7)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(4.5)	6.8
Net increase in cash, cash equivalents, and restricted cash	554.8	97.0
Cash, cash equivalents, and restricted cash, beginning of period	2,062.4	2,770.1
Cash, cash equivalents, and restricted cash, end of period	$ 2,617.2	$ 2,867.1

Depreciation and Gain (Loss) on Disposition of Property Plant Equipment

No definition available.

Name:	isrg_DepreciationandGainLossonDispositionofPropertyPlantEquipment
Namespace Prefix:	isrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.