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Marketable Securities and Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2026
Fair Value Disclosures [Abstract] |
Schedule of Available-for-Sale Marketable Securities | The following is a summary of the Company’s available-for-sale marketable securities measured at fair value on a recurring basis.
|  | March 31, 2026
(dollars in millions) |  | Valuation Hierarchy |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate bonds |  | Level 2 |  | $ | 503.6 |  |  | $ | 0.3 |  |  | $ | (0.7) |  |  | $ | 503.2 |
Government securities |  | Level 2 |  | 24.4 |  |  | — |  |  | — |  |  | 24.4 |
Total |  |  |  | $ | 528.0 |  |  | $ | 0.3 |  |  | $ | (0.7) |  |  | $ | 527.6 |
|  | December 31, 2025
(dollars in millions) |  | Valuation Hierarchy |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate bonds |  | Level 2 |  | $ | 528.0 |  |  | $ | 1.1 |  |  | $ | — |  |  | $ | 529.1 |
Government securities |  | Level 2 |  | 13.3 |  |  | 0.1 |  |  | — |  |  | 13.4 |
Total |  |  |  | $ | 541.3 |  |  | $ | 1.2 |  |  | $ | — |  |  | $ | 542.5 |

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