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Stock-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Compensation [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,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Restricted stock |  | $ | 0.7 |  |  | $ | 0.7 |  |  | $ | 1.5 |  |  | $ | 1.4 |
Restricted stock units |  | 0.8 |  |  | 1.3 |  |  | 2.2 |  |  | 3.7 |
Total |  | $ | 1.5 |  |  | $ | 2.0 |  |  | $ | 3.7 |  |  | $ | 5.1 |
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, 2018 |  | 150,647 |  |  | $ | 117.41 |
Granted |  | 5,301 |  |  | 441.54 |
Vested |  | (17,971 | ) |  | 148.14 |
Forfeited |  | (214 | ) |  | 371.74 |
Non-vested as of June 30, 2019 |  | 137,763 |  |  | $ | 125.48 |
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, 2018 |  | 516,773 |  |  | $ | 127.07 |
Granted |  | 3,000 |  |  | 453.64 |
Converted |  | (87,842 | ) |  | 106.54 |
Forfeited |  | (3,100 | ) |  | 206.45 |
Outstanding as of June 30, 2019 |  | 428,831 |  |  | $ | 132.99 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=109197908&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=109197908&loc=d3e5070-113901 + Details
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