Investments - Current and Non-current of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Reported under the following captions in our consolidated balance sheets: | ||
| Total | $ 1,921.5 | $ 3,050.0 |
| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | ||
| Reported under the following captions in our consolidated balance sheets: | ||
| Current available-for-sale debt securities | 0.0 | 37.0 |
| Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesCurrent | ||
| Reported under the following captions in our consolidated balance sheets: | ||
| Current available-for-sale debt securities | 780.4 | 1,236.3 |
| Balance Sheet Location [Axis]: us-gaap:MarketableSecuritiesNoncurrent | ||
| Reported under the following captions in our consolidated balance sheets: | ||
| Non-current marketable investments | $ 1,141.1 | $ 1,776.7 |