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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
STOCK-BASED COMPENSATION |
Summary of information related to stock-based incentive compensation plans | ​
​ | ​ | ​
​ | ​ | March 31, 2025
​ | ​ | (in millions)
Shares available for future issuance under the 2023 Incentive Plan | ​ | 1.4
Shares available for future issuance under the ESPP | ​ | 0.5
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ |  | 2025 |  | 2024 |
​ | ​ | (in millions) | ​
Stock-based compensation expense | ​ | $ | 13.0 | ​ | $ | 11.0 | ​
Summary of changes in RSUs | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2025
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ | RSUs | ​ | Fair Value
​ | ​ | (in millions) | ​ | ​
RSUs outstanding at beginning of period |  | 1.0 | ​ | $ | 95.05
RSUs granted |  | 0.5 | ​ | $ | 119.46
RSUs vested |  | (0.3) | ​ | $ | 85.42
RSUs forfeited |  | (0.1) | ​ | $ | 73.90
RSUs outstanding at end of period |  | 1.1 | ​ | $ | 109.58
​

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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