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LONG-TERM DEBT (Tables) | 9 Months Ended
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Sep. 30, 2024
Long-Term Debt, Unclassified [Abstract] |
Schedule of convertible debt | The following is a summary of our convertible debt instruments as of September 30, 2024:
(in millions) |  | Principal Amount |  | Unamortized Debt Issuance Costs |  | Net Carrying Amount |  | Fair Value Amount (1)
2027 Notes |  | $ | 862.5 |  |  | $ | (8.8) |  |  | $ | 853.7 |  |  | $ | 936.3 |
2029 Notes |  | 862.5 |  |  | (9.3) |  |  | 853.2 |  |  | 954.7 |
(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 September 30, 2024 |  | Nine Months Ended September 30, 2024
2027 Notes |  |  |  |
Contractual interest expense |  | $ | 9.4 |  |  | $ | 12.9 |
Amortization of debt issuance costs |  | 0.8 |  |  | 1.1 |
Total interest expense – 2027 Notes |  | 10.2 |  |  | 14.0 |
2029 Notes |  |  |  |
Contractual interest expense |  | 9.4 |  |  | 12.9 |
Amortization of debt issuance costs |  | 0.5 |  |  | 0.7 |
Total interest expense – 2029 Notes |  | $ | 9.9 |  |  | $ | 13.6 |

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