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Public Utilities, Power Of Renewable Energy

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The amount of cash paid for the settlement of litigation or for other legal issues during the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Segment financial information - Narrative (Details) $ in Millions		6 Months Ended
	Apr. 10, 2026 USD ($) installment	Jun. 30, 2026 USD ($) segment MW	Dec. 31, 2025 USD ($)	Mar. 31, 2025	Dec. 31, 2024	Nov. 01, 2024 installment
Segment financial information
Number of reportable segments \| segment		1
Number of operating segments \| segment		1
Tort-Related Legal Claims \| Maui Windstorm and Wildfires \| Natural Disasters and Other Casualty Events
Segment financial information
Installment payments \| installment	4					4
Securities Action
Segment financial information
First settlement payment	$ 479.0
GLST1, LLC
Segment financial information
Membership interest				60.00%
Equity method investments			$ 287.3
GLST1, LLC
Segment financial information
First settlement payment		$ 479.0
Mahipapa
Segment financial information
Renewable energy (in megawatts) \| MW		7.5
Pretax impairment charge		$ 3.7
American Savings Bank (ASB) \| ASB Hawaii, Inc
Segment financial information
Minority ownership percentage					9.90%