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Electric utility segment - Annual Decoupling Filings (Details) $ in Millions	May 31, 2017 USD ($)
Hawaiian Electric Company, Inc (HECO)
Regulatory Projects and Legal Obligations [Line Items]
2017 Annual incremental RAM adjusted revenues	$ 12.7
Annual change in accrued RBA balance as of December 31, 2016 (and associated revenue taxes) (refunded)	(2.4)
Net annual incremental amount to be collected under the tariffs	10.3
HELCO
Regulatory Projects and Legal Obligations [Line Items]
2017 Annual incremental RAM adjusted revenues	3.2
Annual change in accrued RBA balance as of December 31, 2016 (and associated revenue taxes) (refunded)	(2.5)
Net annual incremental amount to be collected under the tariffs	0.7
MECO
Regulatory Projects and Legal Obligations [Line Items]
2017 Annual incremental RAM adjusted revenues	1.6
Annual change in accrued RBA balance as of December 31, 2016 (and associated revenue taxes) (refunded)	(0.2)
Net annual incremental amount to be collected under the tariffs	$ 1.4