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Stock-Based Compensation Plans | 9 Months Ended
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Sep. 30, 2020
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 September 30, |  | For the Nine Months Ended September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Restricted stock |  | $ | 0.4 |  |  | $ | 0.8 |  |  | $ | 1.5 |  |  | $ | 2.3 |
Restricted stock units |  | 1.1 |  |  | 1.2 |  |  | 3.2 |  |  | 3.4 |
Total |  | $ | 1.5 |  |  | $ | 2.0 |  |  | $ | 4.7 |  |  | $ | 5.7 |
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, 2019 |  | 137,503 |  |  | $ | 125.04 |
Vested |  | (14,633) |  |  | 182.61 |
Forfeited |  | (148) |  |  | 360.67 |
Non-vested as of September 30, 2020 |  | 122,722 |  |  | $ | 117.89 |
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, 2019 |  | 428,831 |  |  | $ | 132.99 |
Granted |  | 5,870 |  |  | 436.89 |
Converted |  | (21,971) |  |  | 105.97 |
Forfeited |  | (112) |  |  | 434.60 |
Outstanding as of September 30, 2020 |  | 412,618 |  |  | $ | 138.67 |

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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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