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Electric utility segment - Annual Decoupling Filings Summary (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 28, 2024
Jun. 30, 2024
Regulatory Projects and Legal Obligations [Line Items]    
Recovery of COVID-19 related costs $ 3.2  
Return of ERP benefit liability (3.2)  
Net 2024 ARA revenues 0.0  
Incremental ARA revenues   $ 0.0
Incremental PIMs (net)   (2.6)
Incremental MPIR/EPRM revenue adjustment   4.9
Incremental Pilot Process cost recovery   2.7
Net incremental amount to be collected (refunded) under the RBA rate tariffs   5.0
Hawaiian Electric, Parent    
Regulatory Projects and Legal Obligations [Line Items]    
Recovery of COVID-19 related costs 2.2  
Return of ERP benefit liability 0.0  
Net 2024 ARA revenues 2.2  
Incremental ARA revenues   2.2
Incremental PIMs (net)   (1.3)
Incremental MPIR/EPRM revenue adjustment   3.0
Incremental Pilot Process cost recovery   1.9
Net incremental amount to be collected (refunded) under the RBA rate tariffs   5.8
Hawaii Electric Light    
Regulatory Projects and Legal Obligations [Line Items]    
Recovery of COVID-19 related costs 0.5  
Return of ERP benefit liability (1.3)  
Net 2024 ARA revenues (0.8)  
Incremental ARA revenues   (0.8)
Incremental PIMs (net)   (1.1)
Incremental MPIR/EPRM revenue adjustment   0.7
Incremental Pilot Process cost recovery   0.3
Net incremental amount to be collected (refunded) under the RBA rate tariffs   (0.9)
Maui Electric    
Regulatory Projects and Legal Obligations [Line Items]    
Recovery of COVID-19 related costs 0.5  
Return of ERP benefit liability (1.9)  
Net 2024 ARA revenues $ (1.4)  
Incremental ARA revenues   (1.4)
Incremental PIMs (net)   (0.2)
Incremental MPIR/EPRM revenue adjustment   1.2
Incremental Pilot Process cost recovery   0.5
Net incremental amount to be collected (refunded) under the RBA rate tariffs   $ 0.1