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Stock-Based Compensation (Tables) | 3 Months Ended
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Jun. 30, 2025
Stock-Based Compensation |
Fair Value of Stock-Based Compensation Awards | The weighted-average fair value of stock-based compensation awards granted during the three months ended June 30, 2025 and 2024 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended June 30,
​ | ​ | 2025 | ​ | 2024
​ | ​ | ​ | ​ | Fair Value | ​ | ​ | ​ | Fair Value
​ | ​ | Shares |  | Per Award |  | Shares |  | Per Award
Performance stock awards |  | 0.1 | ​ | $ | 104.26 |  | 0.1 | ​ | $ | 103.77
Restricted stock awards |  | — | ​ | $ | 103.41 |  | — | ​ | $ | 103.77
Unrecognized Compensation Expense Related to Non-Vested Stock-Based Compensation Awards | As of June 30, 2025, unrecognized compensation expense related to non-vested stock-based compensation awards, which will be recognized as expense over the remaining service periods, was as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrecognized | ​ | Weighted-Average
​ | ​ | Compensation | ​ | Remaining Service
​ |  | Expense |  | Period in Years
Performance stock awards | ​ | $ | 37.1 |  | 2.2
Restricted stock awards | ​ |  | 7.4 |  | 2.0
Total | ​ | $ | 44.5 |  | 2.2
​

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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (i) -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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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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