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LONG-TERM DEBT (Tables)
 9 Months Ended
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, 2024Nine 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 Notes10.2 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