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Financial Instruments (Narrative) (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Sep. 02, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Realized investment gains (losses) | $ 0 | $ 0 | $ 0 | $ 0 |  |
Change in fair value of contingent consideration |  |  | (12,170,000) | 21,900,000 |  |
Business combination, contingent consideration, liability | 51,700,000 |  | 51,700,000 |  | $ 63,900,000 |
Ascyrus Medical LLC |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Percentage of outstanding equity acquired |  |  |  |  |  | 100.00%
Maximum amount of future consideration payment |  |  |  |  |  | $ 100,000,000.0
Change in fair value of contingent consideration | $ 3,500,000 | $ 6,200,000 | $ (12,200,000) | $ 21,900,000 |  |
Ascyrus Medical LLC | Measurement Input, Discount Rate |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration, measurement input | 0.16 |  | 0.16 |  |  |

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