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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The following table summarizes our stock-based compensation expense for the three months ended March 31, 2015 and 2014.
|  | Three Months Ended
|  | March 31,
(in millions) |  | 2015 |  | 2014
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”) |  | $ | 3.5 |  |  | $ | 1.6 |
Stock options |  | 0.1 |  |  | 0.2 |
Stock-based compensation expense, before income taxes |  | 3.6 |  |  | 1.8 |
Tax benefit |  | (0.3 | ) |  | (0.8 | )
Stock-based compensation expense, net of tax |  | $ | 3.3 |  |  | $ | 1.0 |
As of March 31, 2015, total unrecognized compensation cost related to non-vested RSUs and PRSUs was $31.9 million, which is expected to be recognized over a weighted average period of 2.7 years, and total unrecognized compensation cost related to non-vested stock options was $0.5 million, which is expected to be recognized over a weighted average period of 2.4 years. RSUs and PRSUs The following table summarizes activity for the three months ended March 31, 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 |  | 388,506 |  |  | 29.83 |
PRSUs |  | 225,694 |  |  | 29.83 |
Vested: |  |  |  |
RSUs |  | (352,233 | ) |  | 23.22 |
PRSUs |  | (63,642 | ) |  | 30.47 |
Forfeitures: |  |  |  |
RSUs |  | (13,509 | ) |  | 24.94 |
PRSUs |  | (25,751 | ) |  | 30.07 |
Non-vested as of March 31, 2015 |  | 1,437,667 |  |  | 25.77 |
Stock Options The following table summarizes activity for the three months ended March 31, 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 March 31, 2015 |  | 294,897 |  |  | 15.72 |
Exercisable as of March 31, 2015 |  | 182,661 |  |  | 10.84 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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