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LONG-TERM DEBT (Tables) | 6 Months Ended
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Jun. 30, 2024
Long-Term Debt, Unclassified [Abstract] |
Schedule of convertible debt | The following is a summary of our convertible debt instruments as of June 30, 2024:
(in millions) |  | Principal Amount |  | Unamortized Debt Issuance Costs |  | Net Carrying Amount |  | Fair Value Amount (1)
2027 Notes |  | $ | 862.5 |  |  | $ | (9.0) |  |  | $ | 853.5 |  |  | $ | 856.4 |
2029 Notes |  | 862.5 |  |  | (9.2) |  |  | 853.3 |  |  | 856.5 |
(1) The fair values are categorized in Level 2 of the fair value hierarchy. See Note 15, Fair Value Measurements, for more information on the levels of the fair value hierarchy.
Schedule of convertible debt interest expense | The following table provides a summary of the interest expense recorded for each of the 2027 Notes and 2029 Notes:
(in millions) |  | Three Months Ended June 30, 2024 |  | Six Months Ended June 30, 2024
2027 Notes |  |  |  |
Contractual interest expense |  | $ | 3.5 |  |  | $ | 3.5 |
Amortization of debt issuance costs |  | 0.3 |  |  | 0.3 |
Total interest expense - 2027 Notes |  | 3.8 |  |  | 3.8 |
2029 Notes |  |  |  |
Contractual interest expense |  | 3.5 |  |  | 3.5 |
Amortization of debt issuance costs |  | 0.2 |  |  | 0.2 |
Total interest expense - 2029 Notes |  | $ | 3.7 |  |  | $ | 3.7 |

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