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Electric utility segment - Annual decoupling filings summary (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Regulatory Projects and Legal Obligations [Line Items]  
2021 ARA revenues $ 10.3
Management Audit savings commitment (6.6)
Net incremental revenues 3.7
Incremental RAM revenues and ARA revenues (23.0)
Annual change in accrued RBA balance as of December 31, 2020 (and associated revenue taxes) 25.0
Incremental Performance Incentive Mechanisms (net) 0.7
Incremental MPIR/EPRM Revenue Adjustment 12.8
Incremental Affiliate Transaction Refund/PUC Ordered Adjustment 2.0
Net incremental amount to be collected under the RBA rate tariffs 17.4
Hawaiian Electric, Parent  
Regulatory Projects and Legal Obligations [Line Items]  
2021 ARA revenues 6.9
Management Audit savings commitment (4.6)
Net incremental revenues 2.3
Incremental RAM revenues and ARA revenues (14.7)
Annual change in accrued RBA balance as of December 31, 2020 (and associated revenue taxes) 10.4
Incremental Performance Incentive Mechanisms (net) 0.0
Incremental MPIR/EPRM Revenue Adjustment 12.6
Incremental Affiliate Transaction Refund/PUC Ordered Adjustment 0.0
Net incremental amount to be collected under the RBA rate tariffs 8.3
Hawaii Electric Light  
Regulatory Projects and Legal Obligations [Line Items]  
2021 ARA revenues 1.7
Management Audit savings commitment (1.0)
Net incremental revenues 0.7
Incremental RAM revenues and ARA revenues (2.2)
Annual change in accrued RBA balance as of December 31, 2020 (and associated revenue taxes) 5.7
Incremental Performance Incentive Mechanisms (net) 0.2
Incremental MPIR/EPRM Revenue Adjustment 0.1
Net incremental amount to be collected under the RBA rate tariffs 3.8
Maui Electric  
Regulatory Projects and Legal Obligations [Line Items]  
2021 ARA revenues 1.7
Management Audit savings commitment (1.0)
Net incremental revenues 0.7
Incremental RAM revenues and ARA revenues (6.1)
Annual change in accrued RBA balance as of December 31, 2020 (and associated revenue taxes) 8.9
Incremental Performance Incentive Mechanisms (net) 0.5
Incremental MPIR/EPRM Revenue Adjustment 0.1
Incremental Affiliate Transaction Refund/PUC Ordered Adjustment 2.0
Net incremental amount to be collected under the RBA rate tariffs $ 5.3