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Share-based compensation - Summary of income taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based compensation |  |  |  |
Share-based compensation expense | $ 3.5 | $ 2.9 | $ 5.6 | $ 5.5
Income tax benefit | 0.8 | 0.5 | 1.1 | 1.0
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Share-based compensation |  |  |  |
Share-based compensation expense | 1.0 | 0.9 | 1.6 | 2.0
Income tax benefit | $ 0.3 | $ 0.2 | $ 0.4 | $ 0.4

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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