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Employee Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of the activity with respect to RSAs and RSUs for the year ended December 31, 2018 is as follows:
| Shares |  | Weighted-Average Grant-Date Fair Value per Share
Outstanding at December 31, 2017 | 216,953 |  |  | $ | 74.04 |
Granted | 74,138 |  |  | 96.40 |
Vested | (64,061 | ) |  | 73.25 |
Forfeited | (7,517 | ) |  | 77.17 |
Outstanding at December 31, 2018 | 219,513 |  |  | $ | 80.99 |
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,
| 2018 |  | 2017 |  | 2016
Grant date fair value | $ | 127.41 |  |  | $ | 97.88 |  |  | $ | 93.02 |
Grant date stock price | $ | 101.66 |  |  | $ | 79.69 |  |  | $ | 80.46 |
Expected volatility of Kaiser Aluminum 1 | 24.86 | % |  | 22.74 | % |  | 17.81 | %
Expected volatility of peer companies 1 | 44.74 | % |  | 44.19 | % |  | 41.22 | %
Risk-free interest rate | 2.37 | % |  | 1.54 | % |  | 1.01 | %
Dividend yield | 2.16 | % |  | 2.50 | % |  | 2.24 | %
_____________________ 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 | A summary of the activity with respect to performance shares for the year ended December 31, 2018 is as follows:
| Shares |  | Weighted-Average Grant-Date Fair Value per Share
Outstanding at December 31, 2017 | 459,669 |  |  | $ | 90.12 |
Granted 1 | 124,833 |  |  | 109.38 |
Vested | (125,674 | ) |  | 95.68 |
Forfeited 1 | (10,261 | ) |  | 94.85 |
Canceled 1 | (22,207 | ) |  | 95.68 |
Outstanding at December 31, 2018 | 426,360 |  |  | $ | 93.72 |
_____________________ 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. Non-cash compensation expense by type of award under LTI Programs was as follows for each period presented (in millions of dollars):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
RSAs and RSUs | $ | 5.8 |  |  | $ | 5.4 |  |  | $ | 4.7 |
Performance shares | 4.3 |  |  | 7.7 |  |  | 7.0 |
Total non-cash compensation expense | $ | 10.1 |  |  | $ | 13.1 |  |  | $ | 11.7 |
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, 2018:
| 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 | $ | 8.7 |  |  | 2.5
Performance shares | $ | 6.0 |  |  | 1.6
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 each period presented:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
RSAs and RSUs | $ | 96.40 |  |  | $ | 77.35 |  |  | $ | 76.82 |
Performance shares | $ | 109.38 |  |  | $ | 86.97 |  |  | $ | 88.00 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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