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Share-based compensation - Summary of income taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based compensation
Share-based compensation expense	$ 2.6	$ 1.7
Income tax benefit	0.4	0.3
Hawaiian Electric Company, Inc. and Subsidiaries
Share-based compensation
Share-based compensation expense	1.1	0.8
Income tax benefit	$ 0.3	$ 0.1

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

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No definition available.

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