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Share-based compensation Share-based Compensation Expense and Related Income Tax Benefits (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense (in dollars) | $ 9.3 us-gaap_AllocatedShareBasedCompensationExpense | $ 7.8 us-gaap_AllocatedShareBasedCompensationExpense | $ 6.7 us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit (in dollars) | 3.4 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 2.8 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 2.4 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Capitalized share-based compensation expense | 0.16 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | 0.11 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | 0.08 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense (in dollars) | 3.1 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 2.3 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 1.8 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Income tax benefit (in dollars) | $ 1.2 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 0.9 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 0.7 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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