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Debt Schedule of Debt (Tables) | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Debt | A summary of debt is as follows (in millions):
|  |  | September 30, 2025 |  | December 31, 2024
| Maturity |  | Current |  | Long-Term |  | Current |  | Long-Term
8.25% Notes: | Feb. 2027 |  |  |  |  |  |  |  |
Principal |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 74.3 |
Interest |  |  | — |  |  | — |  |  | 6.1 |  |  | 9.2 |
2.25% Convertible Notes: | Nov. 2030 |  |  |  |  |  |  |  |
Principal |  |  | — |  |  | 402.5 |  |  | — |  |  | 402.5 |
0% Convertible Notes: | Aug. 2032 |  |  |  |  |  |  |  |
Principal |  |  | — |  |  | 805.0 |  |  | — |  |  | — |
Total |  |  | $ | — |  |  | $ | 1,207.5 |  |  | $ | 6.1 |  |  | $ | 486.0 |
A summary of interest expense and amortization of debt issuance costs is as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Contractual interest expense | $ | 2.3 |  |  | $ | — |  |  | $ | 6.8 |  |  | $ | — |
Amortization of debt issuance costs and discount | 0.9 |  |  | — |  |  | 2.0 |  |  | — |
Total interest expense on debt | $ | 3.2 |  |  | $ | — |  |  | $ | 8.8 |  |  | $ | — |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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