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Electric utility segment - Annual Decoupling Filings (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory Projects and Legal Obligations [Line Items]
2020 Annual incremental RAM adjusted revenues	$ 29.5
Annual change in accrued RBA balance as of December 31, 2019 (and associated revenue taxes) which incorporates MPIR recovery	(67.4)
Incremental Performance Incentive Mechanisms (net)	2.0
Net annual incremental amount to be refunded under the tariffs	(35.9)
Hawaiian Electric
Regulatory Projects and Legal Obligations [Line Items]
2020 Annual incremental RAM adjusted revenues	20.6
Annual change in accrued RBA balance as of December 31, 2019 (and associated revenue taxes) which incorporates MPIR recovery	(46.5)
Incremental Performance Incentive Mechanisms (net)	2.2
Net annual incremental amount to be refunded under the tariffs	(23.7)
HELCO
Regulatory Projects and Legal Obligations [Line Items]
2020 Annual incremental RAM adjusted revenues	3.2
Annual change in accrued RBA balance as of December 31, 2019 (and associated revenue taxes) which incorporates MPIR recovery	(9.9)
Incremental Performance Incentive Mechanisms (net)	(0.1)
Net annual incremental amount to be refunded under the tariffs	(6.8)
Maui Electric
Regulatory Projects and Legal Obligations [Line Items]
2020 Annual incremental RAM adjusted revenues	5.7
Annual change in accrued RBA balance as of December 31, 2019 (and associated revenue taxes) which incorporates MPIR recovery	(11.0)
Incremental Performance Incentive Mechanisms (net)	(0.1)
Net annual incremental amount to be refunded under the tariffs	$ (5.4)