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Related party transactions (Details) - Affiliated Entity - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Related Party Transaction [Line Items] |  |
General management and administrative services from related parties | $ 2.1 | $ 1.7
American Savings Bank (ASB) |  |
Related Party Transaction [Line Items] |  |
General management and administrative services from related parties | 0.8 | 0.3
Hawaii Medical Service Association (HMSA) | HMSA costs |  |
Related Party Transaction [Line Items] |  |
Expenses from transactions with related party | 7.0 | 7.0
Hawaii Medical Service Association (HMSA) | HMSA costs | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Related Party Transaction [Line Items] |  |
Expenses from transactions with related party | 6.0 | 6.0
Hawaii Medical Service Association (HMSA) | HMSA expense |  |
Related Party Transaction [Line Items] |  |
Expenses from transactions with related party | 5.0 | 5.0
Hawaii Medical Service Association (HMSA) | HMSA expense | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Related Party Transaction [Line Items] |  |
Expenses from transactions with related party | 3.0 | 4.0
Hawaii Dental Service (HDS) | HDS costs |  |
Related Party Transaction [Line Items] |  |
Expenses from transactions with related party | 1.0 | 1.0
Hawaii Dental Service (HDS) | HDS costs | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Related Party Transaction [Line Items] |  |
Expenses from transactions with related party | 1.0 | 1.0
Hawaii Dental Service (HDS) | HDS expense |  |
Related Party Transaction [Line Items] |  |
Expenses from transactions with related party | 1.0 | 1.0
Hawaii Dental Service (HDS) | HDS expense | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Related Party Transaction [Line Items] |  |
Expenses from transactions with related party | $ 0.0 | $ 0.0

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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