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Commitments and Contingencies - Narrative (Details) a in Thousands, gal in Millions, $ in Millions |  |  |  | 1 Months Ended | 2 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 11, 2019 license | Jan. 07, 2019 gal | Apr. 10, 2015 plaintiff | May 31, 2016 | Dec. 31, 2015 plaintiff | Jan. 31, 2019 | Dec. 31, 2020 USD ($) | Dec. 31, 2018 a license
EMI |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Ownership interest held (percent) |  |  |  |  |  | 50.00% |  |
EMI | Maui |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Area of land sold (acres) | a |  |  |  |  |  |  |  | 41
EMI | East Maui |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Watershed lands owned (in acres) | a |  |  |  |  |  |  |  | 16
State of Hawaii | East Maui |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of water licenses held and extended as revocable permits | license |  |  |  |  |  |  |  | 4
Additional watershed lands accessible by licenses (in acres) | a |  |  |  |  |  |  |  | 30
Financial Guarantee |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Guarantor obligations, current carrying value |  |  |  |  |  |  | $ 0.0 |
Bonds related to real estate and construction |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Possible administrative penalty |  |  |  |  |  |  | 258.6 |
Bid, Performance and Payment Bonds and Commercial Bonds |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Estimated remaining exposure |  |  |  |  |  |  | 59.2 |
Long Term Water Lease Request |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of water licenses held and extended as revocable permits | license | 4 |  |  |  |  |  |  |
Number of parties filed lawsuit | plaintiff |  |  | 3 |  | 3 |  |  |
Duration of revocable permits for disposition of water rights | 1 year |  |  | 3 years |  |  |  |
Sierra Club Lawsuit Against BLNR, A&B, and EMI |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of gallons per day sought to be enjoined (gallons) | gal |  | 25 |  |  |  |  |  |
Maximum | Bonds related to real estate and construction |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Possible administrative penalty |  |  |  |  |  |  | 277.9 |
Revolving Credit Facility | A&B Revolver |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  | $ 1.1 |

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