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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets Measured at Fair Value on Recurring Basis | The following table presents a summary of certain financial assets, which were measured at fair value on a recurring basis.
| September 30, 2025 |  | December 31, 2024
| Fair Value |  | Leveling |  | Fair Value |  | Leveling
(in millions) |  | Level 1 |  | Level 2 |  |  | Level 1 |  | Level 2
Cash and cash equivalents | $ | 340.2 |  |  | $ | 340.2 |  |  | $ | — |  |  | $ | 233.0 |  |  | $ | 233.0 |  |  | $ | — |
Available-for-sale debt securities | 1,773.1 |  |  | — |  |  | 1,773.1 |  |  | 1,582.6 |  |  | — |  |  | 1,582.6 |
Equity investments | 118.1 |  |  | 118.1 |  |  | — |  |  | 124.8 |  |  | 124.8 |  |  | — |
| $ | 2,231.4 |  |  | $ | 458.3 |  |  | $ | 1,773.1 |  |  | $ | 1,940.4 |  |  | $ | 357.8 |  |  | $ | 1,582.6 |
Schedule of Revenue by Major Customers by Reporting Segments | The following table presents the percent of total gross product sales for each of our customers who individually accounted for 10% or more of total gross product sales.
| Nine Months Ended September 30,
| 2025 |  | 2024
Customer A | 41 | % |  | 44 | %
Customer B | 28 | % |  | 28 | %
Customer C | 17 | % |  | 13 | %
The following table presents the percent of total accounts receivable for each of our customers who individually accounted for 10% or more of total accounts receivable.
| September 30, 2025 |  | December 31, 2024
Customer A | 45 | % |  | 41 | %
Customer B | 29 | % |  | 37 | %
Customer C | 15 | % |  | < 10 %
Customer D | < 10 % |  | 11 | %

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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