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Stock-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Share-Based Payment Arrangement, Restricted Stock Unit, Activity | A summary of restricted stock unit activity is presented in the following table:
Restricted Stock Units |  | Number of Restricted Stock Units |  | Weighted Average Grant-Date Fair Value Per Share
Outstanding as of December 31, 2022 |  | 341,228 |  |  | $ | 169.28 |
Granted |  | 15,027 |  |  | 466.15
Converted |  | (101,757) |  |  | 233.39
Forfeited |  | (791) |  |  | 461.95
Outstanding as of September 30, 2023 |  | 253,707 |  |  | $ | 160.24 |
Schedule of Stock Based Compensation Expense | Stock-based compensation expense consists of the following:
(In millions) |  | For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
|  | 2023 |  | 2022 |  | 2023 |  | 2022
Stock options |  | $ | 8.0 |  |  | $ | 8.1 |  |  | $ | 25.1 |  |  | $ | 25.1 |
Restricted stock units |  | 1.3 |  |  | 0.6 |  |  | 3.9 |  |  | 1.8 |
Total |  | $ | 9.3 |  |  | $ | 8.7 |  |  | $ | 29.0 |  |  | $ | 26.9 |
Schedule of Future Share-Based Compensation Cost | We expect to recognize the future stock-based compensation expense as follows:
(in millions) |  |  |  |  |  |
Year |  | Total Projected Stock-Based Compensation Expense |  |  |  |
Remainder of 2023 |  | $ | 9.9 |  |  |  |  |
2024 |  | 38.2 |  |  |  |  |
2025 |  | 9.2 |  |  |  |  |
2026 |  | 3.6 |  |  |  |  |
2027 |  | 0.1 |  |  |  |  |
Total |  | $ | 61.0 |  |  |  |  |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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