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v3.25.1

LONG-TERM DEBT (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
LONG-TERM DEBT |
Schedule of long-term debt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2025 |  | 2024
​ | ​ | (in millions)
Convertible Notes due 2028, 2.5% interest | ​ | $ | 575.0 | ​ | $ | 575.0
Less: debt discount | ​ | ​ | (9.6) | ​ | ​ | (10.3)
Net long-term debt | ​ | $ | 565.4 | ​ | $ | 564.7
Schedule of interest expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ |  | 2025 |  | 2024 |
​ | ​ | (in millions) | ​
Interest expense | ​ | $ | 3.5 | ​ | $ | 6.3 | ​
Amortization of debt issuance costs | ​ | ​ | 0.7 | ​ | ​ | 0.8 | ​
Total interest expense related to debt | ​ | $ | 4.2 | ​ | $ | 7.1 | ​

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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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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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