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Share-based compensation - Share-Based Compensation Expense and Related Income Tax Benefit (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Share-based compensation |  |  |  |
Share-based compensation expense | $ 1.8 | $ 3.9 | $ 3.1 | $ 5.9
Income tax benefit | 0.2 | 0.8 | 0.3 | 1.1
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Share-based compensation |  |  |  |
Share-based compensation expense | 0.8 | 1.1 | 1.2 | 1.7
Income tax benefit | $ 0.1 | $ 0.2 | $ 0.1 | $ 0.4

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