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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of share-based compensation expense and related income tax benefit | Share-based compensation expense and the related income tax benefit were as follows:
(in millions) | 2017 |  |  | 2016 |  |  | 2015 |
HEI consolidated |  |  |  |  |
Share-based compensation expense 1 | $ | 5.4 |  |  | $ | 4.8 |  |  | $ | 6.5 |
Income tax benefit | 1.9 |  |  | 1.6 |  |  | 2.3 |
Hawaiian Electric consolidated |  |  |  |  |
Share-based compensation expense 1 | 1.9 |  |  | 1.4 |  |  | 1.9 |
Income tax benefit | 0.7 |  |  | 0.5 |  |  | 0.7 |
1 | For 2017 and 2016, the Company has not capitalized any share-based compensation. In 2015, $0.15 million of this share-based compensation expense was capitalized.
Schedule of common stock granted to nonemployee directors | HEI granted HEI common stock to nonemployee directors of HEI, Hawaiian Electric and ASB under the 2011 Director Plan as follows:
(dollars in millions) | 2017 |  |  | 2016 |  |  | 2015 |
Shares granted | 35,770 |  |  | 19,846 |  |  | 28,246 |
Fair value | $ | 1.2 |  |  | $ | 0.6 |  |  | $ | 0.8 |
Income tax benefit | 0.5 |  |  | 0.2 |  |  | 0.3 |
Schedule of restricted stock units | Information about HEI’s grants of restricted stock units was as follows:
| 2017 |  | 2016 |  | 2015
| Shares |  |  | (1) |  | Shares |  |  | (1) |  | Shares |  |  | (1)
Outstanding, January 1 | 220,683 |  |  | $ | 29.57 |  |  | 210,634 |  |  | $ | 28.82 |  |  | 261,235 |  |  | $ | 25.77 |
Granted | 97,873 |  |  | 33.47 |  |  | 114,431 |  |  | 29.70 |  |  | 85,772 |  |  | 33.69 |
Vested | (92,147 | ) |  | 28.88 |  |  | (85,003 | ) |  | 27.84 |  |  | (102,173 | ) |  | 25.67 |
Forfeited | (29,362 | ) |  | 31.57 |  |  | (19,379 | ) |  | 29.82 |  |  | (34,200 | ) |  | 27.09 |
Outstanding, December 31 | 197,047 |  |  | $ | 31.53 |  |  | 220,683 |  |  | $ | 29.57 |  |  | 210,634 |  |  | $ | 28.82 |
Total weighted-average grant-date fair value of shares granted ($ millions) | $ | 3.3 |  |  |  |  | $ | 3.4 |  |  |  |  | $ | 2.9 |  |  |
(1) | Weighted-average grant-date fair value per share based on the average price of HEI common stock on the date of grant.
Schedule of long-term incentive plan (LTIP) linked to total return to shareholders | Information about HEI’s LTIP grants linked to TSR was as follows:
| 2017 |  | 2016 |  | 2015
| Shares |  |  | (1) |  | Shares |  |  | (1) |  | Shares |  |  | (1)
Outstanding, January 1 | 83,106 |  |  | $ | 22.95 |  |  | 162,500 |  |  | $ | 27.66 |  |  | 257,956 |  |  | $ | 28.45 |
Granted | 37,204 |  |  | 39.51 |  |  | — |  |  | — |  |  | — |  |  | — |
Vested (issued or unissued and cancelled) | (83,106 | ) |  | 22.95 |  |  | (78,553 | ) |  | 32.69 |  |  | (75,915 | ) |  | 30.71 |
Forfeited | (4,300 | ) |  | 39.51 |  |  | (841 | ) |  | 22.95 |  |  | (19,541 | ) |  | 26.25 |
Outstanding, December 31 | 32,904 |  |  | $ | 39.51 |  |  | 83,106 |  |  | $ | 22.95 |  |  | 162,500 |  |  | $ | 27.66 |
Total weighted-average grant-date fair value of shares granted ($ millions) | $ | 1.5 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |
(1) | Weighted-average grant-date fair value per share determined using a Monte Carlo simulation model.
Schedule of assumptions used to determine the fair value of Long-Term Incentive Plan (LTIP) linked to total return to shareholders (TRS) | The following table summarizes the assumptions used to determine the fair value of the LTIP awards linked to TSR and the resulting fair value of LTIP awards granted:
|  | 2017 |
Risk-free interest rate |  | 1.46 | %
Expected life in years |  | 3 |
Expected volatility |  | 20.1 | %
Range of expected volatility for Peer Group |  | 15.4% to 26.0% |
Grant date fair value (per share) |  | $ | 39.51 |
Schedule of long-term incentive plan (LTIP) linked to other performance conditions | Information about HEI’s LTIP awards payable in shares linked to other performance conditions was as follows:
| 2017 |  | 2016 |  | 2015
| Shares |  |  | (1) |  | Shares |  |  | (1) |  | Shares |  |  | (1)
Outstanding, January 1 | 109,816 |  |  | $ | 25.18 |  |  | 222,647 |  |  | $ | 26.02 |  |  | 364,731 |  |  | $ | 26.01 |
Granted | 148,818 |  |  | 33.47 |  |  | — |  |  | — |  |  | — |  |  | — |
Vested | (109,816 | ) |  | 25.18 |  |  | (109,097 | ) |  | 26.89 |  |  | (121,249 | ) |  | 26.05 |
Increase above target (cancelled) | — |  |  | — |  |  | (1,989 | ) |  | 25.26 |  |  | 3,412 |  |  | 26.89 |
Forfeited | (17,202 | ) |  | 33.48 |  |  | (1,745 | ) |  | 25.19 |  |  | (24,247 | ) |  | 25.82 |
Outstanding, December 31 | 131,616 |  |  | $ | 33.47 |  |  | 109,816 |  |  | $ | 25.18 |  |  | 222,647 |  |  | $ | 26.02 |
Total weighted-average grant-date fair value of shares granted (at target performance levels) ($ millions) | $ | 5.0 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |
(1) | Weighted-average grant-date fair value per share based on the average price of HEI common stock on the date of grant.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value of shares that were outstanding at the beginning and end of the year, and the number of Long-Term Incentive Plan awards that were granted, vested, or forfeited during the year that were linked to other performance conditions. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for long-term incentive plan awards that were outstanding at the beginning and end of the year, and the number that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of Long-Term Incentive Plan linked to total return to shareholders, including, but not limited to: (a) expected term of awards, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock awards granted to nonemployee directors that were outstanding at the beginning and end of the year, and the number of awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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