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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2020
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The following table summarizes our stock-based compensation expense for the three and six months ended June 30, 2020 and 2019.
|  | Three Months Ended |  |  |  | Six Months Ended |  |
|  | June 30, |  |  |  | June 30, |  |
(in millions) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes |  | $ | 6.1 |  |  | $ | 5.5 |  |  | $ | 11.9 |  |  | $ | 10.8 |
Tax benefit |  | (0.3) |  |  | (0.4) |  |  | (0.7) |  |  | (0.7) |
Stock-based compensation expense, net of tax |  | $ | 5.8 |  |  | $ | 5.1 |  |  | $ | 11.2 |  |  | $ | 10.1 |
As of June 30, 2020, total unrecognized compensation cost related to non-vested RSUs and PRSUs was $35.3 million, which is expected to be recognized over a weighted average period of 2.1 years. RSUs and PRSUs The following table summarizes activity for the six months ended June 30, 2020, of RSUs and PRSUs issued to our employees.
|  | Activity |  | Weighted Average Per Share Grant Date Fair Market Value
Non-vested as of December 31, 2019 |  | 2,024,768 |  |  | $ | 22.09 |
Granted: |  |  |  |
RSUs |  | 751,308 |  |  | 29.91 |
PRSUs |  | 323,771 |  |  | 29.60 |
Vested: |  |  |  |
RSUs |  | (653,685) |  |  | 22.88 |
PRSUs |  | (298,824) |  |  | 22.53 |
Forfeitures: |  |  |  |
RSUs |  | (18,026) |  |  | 24.87 |
PRSUs |  | (1,958) |  |  | 30.63 |
Non-vested as of June 30, 2020 |  | 2,127,354 |  |  | 25.66 |
Stock Options The following table summarizes activity for the six months ended June 30, 2020, of stock options issued to our employees.
|  | Activity |  | Weighted Average Exercise Price
Outstanding as of December 31, 2019 |  | 126,528 |  |  | $ | 24.57 |
Exercised |  | (23,115) |  |  | 16.43 |
Outstanding as of June 30, 2020 |  | 103,413 |  |  | 26.39 |
Exercisable as of June 30, 2020 |  | 103,413 |  |  | 26.39 |
As of June 30, 2020, all exercisable stock options issued to our employees were out-of-the-money based on the closing stock price of our common stock of $14.17.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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