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Segment financial information - Narrative (Details) $ in Millions			3 Months Ended	12 Months Ended
	Dec. 31, 2024 segment	Dec. 30, 2024 USD ($)	Mar. 31, 2025 USD ($) subsidiary	Dec. 30, 2024 USD ($) segment	Dec. 31, 2017 MW
Segment financial information
Number of reportable segments | segment	1			2
Number of operating segments | segment	1			2
GLST1, LLC
Segment financial information
Membership interest			60.00%
Investment in unconsolidated affiliate			$ 287.3
Hamakua Energy
Segment financial information
Power produced by power plants (in megawatts) | MW					60
Hamakua Holdings, LLC
Segment financial information
Number of wholly-owned subsidiaries | subsidiary			2
American Savings Bank (ASB) | ASB Hawaii, Inc
Segment financial information
Minority ownership percentage			9.90%
Noncontrolling ownership interest			$ 44.6
Discontinued Operations, Disposed of by Sale | American Savings Bank (ASB)
Segment financial information
Ownership percentage disposed	90.10%	90.10%
Consideration amount		$ 405.5		$ 405.5
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Hamakua Holdings, LLC
Segment financial information
Loss on sale			$ 13.2

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