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Stock-Based Compensation Plans | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Stock Based Compensation Expense | Stock-based compensation expense consists of the following:
(In millions) |  | For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Restricted stock |  | $ | (8.3) |  |  | $ | 0.5 |  |  | $ | (7.9) |  |  | $ | 1.1 |
Restricted stock units |  | (2.6) |  |  | 0.9 |  |  | (1.9) |  |  | 2.1 |
Total |  | $ | (10.9) |  |  | $ | 1.4 |  |  | $ | (9.8) |  |  | $ | 3.2 |
The reversal of stock-based compensation expense for the three and six months ended June 30, 2021 was primarily due to the forfeiture of unvested restricted stock and restricted stock units upon the retirement of our former Chief Executive Officer in May 2021, which resulted in an $11.5 million reversal of stock-based compensation expense.
Summary of Restricted Stock Activity | A summary of the non-vested restricted stock activity is presented below:
Restricted Stock |  | Number of Shares |  | Weighted Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2020 |  | 122,718 |  |  | $ | 117.88 |
Vested |  | (12,130) |  |  | 177.77 |
Forfeited |  | (109,028) |  |  | 106.59 |
Non-vested as of June 30, 2021 |  | 1,560 |  |  | $ | 441.54 |
Summary Of Restricted Stock Units Activity | A summary of the restricted stock unit activity is presented below:
Restricted Stock Units |  | Number of Restricted Stock Units |  | Weighted Average Grant-Date Fair Value Per Share
Outstanding as of December 31, 2020 |  | 412,602 |  |  | $ | 138.65 |
Granted |  | 7,302 |  |  | 366.07 |
Converted |  | (11,416) |  |  | 190.32 |
Forfeited |  | (31,229) |  |  | 108.59 |
Outstanding as of June 30, 2021 |  | 377,259 |  |  | $ | 143.98 |
Schedule of Future Share-Based Compensation Cost | We expect to recognize the future expense of the stock options as follows:
(in millions) |  |  |  |  |  |
For the Years Ended December 31, |  | Total Projected Expense of Stock Options |  |  |  |
2021 |  | $ | 33.6 |  |  |  |  |
2022 |  | 36.9 |  |  |  |  |
2023 |  | 36.3 |  |  |  |  |
2024 |  | 36.3 |  |  |  |  |
2025 |  | 2.2 |  |  |  |  |
Total |  | $ | 145.3 |  |  |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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