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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based compensation expense | The following table summarizes our stock-based compensation expense for the three months and six months ended June 30, 2015 and 2014.
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
(in millions) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”) |  | $ | 4.4 |  |  | $ | 2.7 |  |  | $ | 7.9 |  |  | $ | 4.3 |
Stock options |  | — |  |  | 0.2 |  |  | 0.1 |  |  | 0.4 |
Stock-based compensation expense, before income taxes |  | 4.4 |  |  | 2.9 |  |  | 8.0 |  |  | 4.7 |
Tax benefit |  | (0.4 | ) |  | (1.3 | ) |  | (0.7 | ) |  | (2.1 | )
Stock-based compensation expense, net of tax |  | $ | 4.0 |  |  | $ | 1.6 |  |  | $ | 7.3 |  |  | $ | 2.6 |
Activity of RSUs and PRSUs Issued to Our Employees | The following table summarizes activity for the six months ended June 30, 2015, of RSUs and PRSUs issued to our employees.
|  | Activity |  | Weighted Average Per Share Grant Date Fair Market Value
Non-vested as of December 31, 2014 |  | 1,278,602 |  |  | $ | 21.92 |
Granted: |  |  |  |
RSUs |  | 419,609 |  |  | 29.64 |
PRSUs |  | 226,197 |  |  | 29.83 |
Vested: |  |  |  |
RSUs |  | (458,074 | ) |  | 21.15 |
PRSUs |  | (65,669 | ) |  | 28.89 |
Forfeitures: |  |  |  |
RSUs |  | (19,219 | ) |  | 25.07 |
PRSUs |  | (25,751 | ) |  | 26.42 |
Non-vested as of June 30, 2015 |  | 1,355,695 |  |  | 26.41 |
Activity of Stock Options Issued to Our Employees | The following table summarizes activity for the six months ended June 30, 2015, of stock options issued to our employees.
|  | Activity |  | Weighted Average Exercise Price
Outstanding as of December 31, 2014 |  | 450,890 |  |  | $ | 15.29 |
Exercised |  | (141,600 | ) |  | 14.67 |
Forfeited or expired |  | (14,393 | ) |  | 12.73 |
Outstanding as of June 30, 2015 |  | 294,897 |  |  | 15.72 |
Exercisable as of June 30, 2015 |  | 182,661 |  |  | 10.84 |

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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 change in restricted stock units (RSUs). + References No definition available. + Details
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