Fair Value Measurements, Equity Investments and Other Financial Instruments - Equity Investment Without Readily Determinable Fair Value (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2022 |
Mar. 31, 2022 |
Dec. 31, 2020 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Equity Securities without Readily Determinable Fair Value [Roll Forward] | ||||||
| Carrying value at the beginning of period | $ 45.8 | $ 13.3 | $ 45.8 | $ 25.4 | ||
| Purchases | 0.0 | 0.0 | 14.7 | |||
| Impairments or downward adjustments | $ (16.1) | $ (15.5) | 0.0 | (31.6) | 0.0 | |
| Upward adjustments | $ 15.1 | 0.0 | 0.0 | 6.6 | ||
| Currency translation on investments | 0.5 | (0.9) | (0.9) | |||
| Carrying value at the end of period | $ 0.0 | $ 25.4 | $ 13.8 | $ 13.3 | $ 45.8 | |