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Employee Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | summary of the activity with respect to RSAs and RSUs for the year ended December 31, 2019:
| Shares |  | Weighted-Average Grant-Date Fair Value per Share
Outstanding at December 31, 2018 | 219,513 |  |  | $ | 80.99 |
Granted | 65,731 |  |  | 97.52 |
Vested | (78,712 | ) |  | 89.22 |
Forfeited | (8,530 | ) |  | 93.78 |
Outstanding at December 31, 2019 | 198,002 |  |  | $ | 95.28 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | Inputs and assumptions used in the Monte Carlo simulations to calculate the fair value at grant date of our TSR-Based Performance Shares were as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Grant date fair value | $ | 134.72 |  |  | $ | 127.41 |  |  | $ | 97.88 |
Grant date stock price | $ | 108.79 |  |  | $ | 101.66 |  |  | $ | 79.69 |
Expected volatility of Kaiser Aluminum 1 | 27.35 | % |  | 24.86 | % |  | 22.74 | %
Expected volatility of peer companies 1 | 39.08 | % |  | 44.74 | % |  | 44.19 | %
Risk-free interest rate | 2.51 | % |  | 2.37 | % |  | 1.54 | %
Dividend yield | 2.21 | % |  | 2.16 | % |  | 2.50 | %
_____________________ 1. Expected volatility based on 2.8 years of daily closing share prices from the valuation date to the end of the performance period.
Summary of activity of non-vested common shares, restricted stock units, and performance shares | summary of the activity with respect to performance shares for the year ended December 31, 2019:
| Shares |  | Weighted-Average Grant-Date Fair Value per Share
Outstanding at December 31, 2018 | 426,360 |  |  | $ | 93.72 |
Granted 1 | 118,808 |  |  | 124.10 |
Vested | (77,606 | ) |  | 87.87 |
Forfeited 1 | (11,679 | ) |  | 102.61 |
Canceled 1 | (75,870 | ) |  | 87.87 |
Outstanding at December 31, 2019 | 380,013 |  |  | $ | 100.69 |
_____________________ 1. The number of shares granted and forfeited are presented at their maximum payout; and the number of shares canceled includes the number of shares that did not vest due to performance results falling below those required for maximum payout.
Non-cash compensation expense | Non-Cash Compensation Expense. Non-cash compensation expense relating to all awards is included in SG&A and R&D. The following table presents non-cash compensation expense by type of award under LTI Programs for the periods presented (in millions of dollars):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
RSAs and RSUs | $ | 6.1 |  |  | $ | 5.8 |  |  | $ | 5.4 |
Performance shares | 3.6 |  |  | 4.3 |  |  | 7.7 |
Total non-cash compensation expense | $ | 9.7 |  |  | $ | 10.1 |  |  | $ | 13.1 |
Unrecognized gross compensation cost data | Unrecognized Gross Compensation Cost Data. The following table presents unrecognized gross compensation cost data by type of award as of December 31, 2019:
| Unrecognized Gross Compensation Costs (in millions of dollars) |  | Expected Period (in years) Over Which the Remaining Gross Compensation Costs Will Be Recognized
RSAs and RSUs | $ | 8.4 |  |  | 2.3
Performance shares | $ | 5.4 |  |  | 1.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | The weighted-average grant-date fair value per share for shares granted by type of award was as follows for the periods presented:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
RSAs and RSUs | $ | 97.52 |  |  | $ | 96.40 |  |  | $ | 77.35 |
Performance shares | $ | 124.10 |  |  | $ | 109.38 |  |  | $ | 86.97 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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