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Stock-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2016
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,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Restricted stock |  | $ | 0.7 |  |  | $ | 0.7 |  |  | $ | 1.4 |  |  | $ | 1.7 |
Restricted stock units |  | 1.0 |  |  | 1.9 |  |  | 2.4 |  |  | 5.0 |
Total |  | $ | 1.7 |  |  | $ | 2.6 |  |  | $ | 3.8 |  |  | $ | 6.7 |
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, 2015 |  | 182,311 |  |  | $ | 109.17 |
Granted |  | 7,657 |  |  | 196.96 |
Vested |  | (20,408 | ) |  | 115.74 |
Forfeited |  | (395 | ) |  | 187.17 |
Non-vested as of June 30, 2016 |  | 169,165 |  |  | $ | 112.17 |
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, 2015 |  | 859,419 |  |  | $ | 61.73 |
Granted |  | 250 |  |  | 178.96 |
Converted |  | (404,096 | ) |  | 16.73 |
Outstanding as of June 30, 2016 |  | 455,573 |  |  | $ | 101.70 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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