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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock-based compensation expense | The following table summarizes our stock-based compensation expense for the three and six months ended June 30, 2019 and 2018.
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
(in millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes |  | $ | 5.5 |  |  | $ | 5.6 |  |  | $ | 10.8 |  |  | $ | 10.6 |
Tax benefit |  | (0.4 | ) |  | (0.4 | ) |  | (0.7 | ) |  | (0.7 | )
Stock-based compensation expense, net of tax |  | $ | 5.1 |  |  | $ | 5.2 |  |  | $ | 10.1 |  |  | $ | 9.9 |
Activity of RSUs and PRSUs Issued to Our Employees | The following table summarizes activity for the six months ended June 30, 2019, of RSUs and PRSUs issued to our employees.
|  | Activity |  | Weighted Average Per Share Grant Date Fair Market Value
Non-vested as of December 31, 2018 |  | 1,723,980 |  |  | $ | 22.39 |
Granted: |  |  |  |
RSUs |  | 828,274 |  |  | 21.57 |
PRSUs |  | 376,418 |  |  | 21.41 |
Vested: |  |  |  |
RSUs |  | (584,870 | ) |  | 21.99 |
PRSUs |  | (246,542 | ) |  | 21.99 |
Forfeitures: |  |  |  |
RSUs |  | (31,009 | ) |  | 22.23 |
PRSUs |  | (5,250 | ) |  | 22.17 |
Non-vested as of June 30, 2019 |  | 2,061,001 |  |  | 22.05 |
Activity of Stock Options Issued to Our Employees | The following table summarizes activity for the six months ended June 30, 2019, of stock options issued to our employees.
|  | Activity |  | Weighted Average Exercise Price
Outstanding as of December 31, 2018 |  | 141,847 |  |  | $ | 23.08 |
Exercised |  | (15,319 | ) |  | 10.78 |
Outstanding as of June 30, 2019 |  | 126,528 |  |  | 24.57 |
Exercisable as of June 30, 2019 |  | 126,528 |  |  | 24.57 |

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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=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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