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Share-based compensation - Share-Based Compensation Expense and Related Income Tax Benefit (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Share-based compensation
Share-based compensation expense	$ 0.8	$ 0.8
Income tax benefit	0.1	0.1
Hawaiian Electric Company, Inc. and Subsidiaries
Share-based compensation
Share-based compensation expense	0.5	0.4
Income tax benefit	$ 0.1	$ 0.0

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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