Fair Value Measurements, Equity Investments and Other Financial Instruments - Equity Investment Without Readily Determinable Fair Value (Details) - USD ($) $ in Millions |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2024 |
Dec. 31, 2023 |
|
| Equity Securities without Readily Determinable Fair Value [Roll Forward] | ||
| Carrying value at the beginning of period | $ 13.8 | $ 13.3 |
| Purchases | 0.0 | 0.0 |
| Impairments or downward adjustments | 0.0 | 0.0 |
| Upward adjustments | 0.0 | 0.0 |
| Currency translation on investments | 0.1 | 0.5 |
| Carrying value at the end of period | $ 13.9 | $ 13.8 |