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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2025

STOCK-BASED COMPENSATION

Schedule of information related to stock-based incentive compensation plans

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​	​	​
​	​	June 30, 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

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Three Months Ended June 30,

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Six Months Ended June 30,

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2025

2024

2025

2024

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(in millions)

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Stock-based compensation expense

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$

13.6

​

$

11.4

​

$

26.6

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$

22.4

​

Schedule of changes in RSUs

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​	​	​	​	​	​
​	​	Six Months Ended June 30, 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	​	$	118.92
RSUs vested		(0.4)	​	$	85.09
RSUs forfeited		(0.1)	​	$	82.41
RSUs outstanding at end of period		1.0	​	$	110.88

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Tabular disclosure of share-based payment arrangement.

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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.

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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.

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