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Financial Instruments - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Realized investment gains (losses) | $ 0 |
Net unrealized gains/(losses) on investments | (154,200,000) | $ (16,000,000)
Level 1: |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loss on investment | 21,200,000 |
Level 1: | Broncus |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loss on investment | 21,200,000 |
Level 2: |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Changes in fair value | $ 200,000 |

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