FINANCIAL INSTRUMENTS - Summary of Equity Investment Activity (Details) - Level 2 $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2026
USD ($)
| |
| Fair Value, Level 2 [Abstract] | |
| Beginning balance, carrying value | $ 121.7 |
| Changes in Fair Value | 1.7 |
| Purchases / Sales / Other | 12.0 |
| Ending balance, carrying value | 135.4 |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseAndOtherAssetsCurrent | |
| Fair Value, Level 2 [Abstract] | |
| Ending balance, carrying value | 0.0 |
| Location, Statement of Financial Position, Balance [Axis]: isrg:IntangibleAndOtherAssets | |
| Fair Value, Level 2 [Abstract] | |
| Ending balance, carrying value | $ 135.4 |