LEASES - Lease Receivables (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Mar. 01, 2026 |
Dec. 31, 2025 |
|---|---|---|---|
| Lessor, Lease, Description [Line Items] | |||
| Gross lease receivables | $ 358.4 | $ 317.5 | |
| Unearned income | (27.1) | (14.7) | |
| Subtotal | 331.3 | 302.8 | |
| Allowance for credit loss | (2.6) | (2.6) | |
| Sales-type lease, lease receivable | 328.7 | 300.2 | |
| Prepaid expense and other assets | $ 75.2 | ||
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseAndOtherAssetsCurrent | |||
| Lessor, Lease, Description [Line Items] | |||
| Sales-type lease, lease receivable | 103.7 | 100.9 | |
| Prepaid expense and other assets | 20.0 | ||
| Location, Statement of Financial Position, Balance [Axis]: isrg:IntangibleAndOtherAssets | |||
| Lessor, Lease, Description [Line Items] | |||
| Sales-type lease, lease receivable | $ 225.0 | $ 199.3 | |
| Prepaid expense and other assets | $ 55.2 |