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Stock-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Summary of Transactions of the Company's Share Based Compensation | The following table summarizes the transactions of the Company’s share-based compensation for 2025 and 2024:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in millions) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Stock options |  | $ | 0.9 |  |  | $ | 2.2 |  |  | $ | 5.0 |  |  | $ | 6.4 |
Stock equivalent units |  |  | 0.7 |  |  |  | 0.7 |  |  |  | 1.2 |  |  |  | 4.8 |
Total |  | $ | 1.6 |  |  | $ | 2.9 |  |  | $ | 6.2 |  |  | $ | 11.2 |
Employee Stock Option |
Summary of Transactions of Company's Stock Option Plans | The following table summarizes the transactions of the Company’s share-based compensation plans for the nine months ended September 30, 2025.
|  | Number of shares |  |  | Weighted Average Grant-Date Fair Value |
Nonvested at December 31, 2024 |  |  | 574,671 |  |  | $ | 86.2 |
Granted |  |  | 166,037 |  |  | $ | 107.1 |
Vested |  |  | (170,641 | ) |  | $ | 88.5 |
Forfeited |  |  | (56,492 | ) |  | $ | 42.8 |
Nonvested at September 30, 2025 |  |  | 513,575 |  |  | $ | 97.0 |

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