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Financial Instruments (Narrative) (Details)	3 Months Ended		6 Months Ended
Financial Instruments (Narrative) (Details)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	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			(15,680,000)	15,700,000
Business combination, contingent consideration, liability	48,200,000		48,200,000		$ 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	$ 1,800,000	$ 10,900,000	$ (15,700,000)	$ 15,700,000
Ascyrus Medical LLC \| Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, measurement input	0.17		0.17