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Stock-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2025
Stock-Based Compensation Plans |
Stock-Based Compensation Disclosures (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the six months ended June 30,
​ |  | 2025 |  | 2024
​ | ​ | (in millions)
Compensation cost | ​ | $ | 67.0 | ​ | $ | 56.9
Related income tax benefit | ​ |  | 15.4 | ​ |  | 12.8
Capitalized as part of an asset | ​ |  | 0.6 | ​ |  | 0.7
​

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