Other Consolidated Financial Statement Detail - (Gains) Losses on Investments, Net (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||||
| Net (gains) losses recognized on equity securities | $ (5.3) | $ 30.4 | $ 30.3 | $ 61.0 |
| Less: Net (gains) losses realized on equity securities | 0.0 | 0.6 | (5.4) | 5.5 |
| Net unrealized (gains) losses recognized on equity securities | $ (5.3) | $ 29.8 | $ 35.7 | $ 55.5 |