Balance Sheet Details and Other Financial Information - Short-Term Debts Marketable Securities (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt securities, available-for-sale: | ||
| Amortized Cost | $ 859.9 | $ 1,079.4 |
| Gross Unrealized Gains | 0.0 | 1.6 |
| Gross Unrealized Losses | (3.4) | 0.0 |
| Estimated Market Value | 856.5 | 1,081.0 |
| U.S. government agencies | ||
| Debt securities, available-for-sale: | ||
| Amortized Cost | 337.3 | 356.6 |
| Gross Unrealized Gains | 0.0 | 0.7 |
| Gross Unrealized Losses | (1.3) | 0.0 |
| Estimated Market Value | 336.0 | 357.3 |
| Commercial paper | ||
| Debt securities, available-for-sale: | ||
| Amortized Cost | 132.8 | 123.4 |
| Gross Unrealized Gains | 0.0 | 0.0 |
| Gross Unrealized Losses | (0.2) | 0.0 |
| Estimated Market Value | 132.6 | 123.4 |
| Corporate debt | ||
| Debt securities, available-for-sale: | ||
| Amortized Cost | 389.8 | 599.4 |
| Gross Unrealized Gains | 0.0 | 0.9 |
| Gross Unrealized Losses | (1.9) | 0.0 |
| Estimated Market Value | $ 387.9 | $ 600.3 |