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Stock-Based Compensation Plans | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation Plans | Stock-Based Compensation Plans Stock Option Awards The following table presents a summary of our stock option award activity for the three months ended March 31, 2018:
| Number of Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2017 | 8,465,398 |  |  | $ | 33.74 |
Granted | 529,197 |  |  | 64.79 |
Exercised | (477,086 | ) |  | 24.68 |
Forfeited or expired | (4,512 | ) |  | 49.94 |
Outstanding at March 31, 2018 | 8,512,997 |  |  | 36.17 |
The grant date fair value of stock option awards granted during the three months ended March 31, 2018 was $17.37 per share. The fair value of stock options granted to our employees is estimated on the date of the grant using the Black Scholes option-pricing model, which employs various assumptions. Restricted Stock Awards The following table presents a summary of restricted stock award activity for the three months ended March 31, 2018:
| Shares of Restricted Stock (“RS”) |  | Restricted Stock Units (“RSU”)
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017 | 1,188,662 |  |  | $ | 45.07 |  |  | 285,164 |  |  | $ | 29.95 |
Granted | 94,592 |  |  | 64.79 |  |  | 6,924 |  |  | 67.75 |
RS’s Vested/RSU’s Issued | (123,918 | ) |  | 45.06 |  |  | — |  |  | — |
Forfeited | (24,639 | ) |  | 44.62 |  |  | — |  |  | — |
Outstanding at March 31, 2018 | 1,134,697 |  |  | 46.72 |  |  | 292,088 |  |  | 30.85 |
Performance Unit Awards The following table presents a summary of the activity for performance unit awards to be settled in shares for the three months ended March 31, 2018:
| Number of Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017 | 6,851,542 |  |  | $ | 0.81 |
Granted | 3,830,000 |  |  | 0.83 |
Vested | (2,052,959 | ) |  | 0.95 |
Forfeited | (10,000 | ) |  | 0.92 |
Outstanding at March 31, 2018 | 8,618,583 |  |  | 0.79 |
The performance unit awards granted during the three months ended March 31, 2018 have a grant date fair value of $0.83 per unit, as calculated using a Monte Carlo valuation model. MPLX Awards During the three months ended March 31, 2018, MPLX granted equity-based compensation awards under the MPLX LP 2012 Incentive Compensation Plan. The compensation expense for these awards is not material to our consolidated financial statements.

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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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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