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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

X

- 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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Balance Type:	debit
Period Type:	duration

X

- 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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X

- 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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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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