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Debt - Narrative (Details) kr in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended | 36 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2023 USD ($) | Mar. 31, 2026 USD ($) | Jul. 27, 2028 | Jul. 27, 2027 | Jul. 27, 2026 | Apr. 03, 2026 USD ($) | Dec. 31, 2025 USD ($) | Aug. 31, 2025 NOK (kr) | Aug. 31, 2023 USD ($) | Jul. 31, 2023 USD ($) | Feb. 23, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 614 |  |  |  |  | $ 613 |  |  |  |
SFL Hercules Ltd |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure, undiscounted |  | 59 |  |  |  |  |  | kr 574 |  |  |
$575 million secured bond (Level 1) | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 575 |  |  |  |  |  |  | $ 75 | $ 500 |
Debt instrument, interest rate (as percent) |  |  |  |  |  |  |  |  | 8.375% | 8.375% |
Debt issued as a percent of par (as a percent) |  |  |  |  |  |  |  |  | 100.75% |  |
Five Year First Lien Revolving Credit Facility | SFL Hercules Ltd |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure, undiscounted |  | 41 |  |  |  |  |  | kr 403 |  |  |
Five Year First Lien Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 225 |  |  |  |  |  |  |  |  |  |
Line of credit facility, accordion feature, increase limit | $ 100 |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit and bank guarantees |  | $ 47 |  |  |  |  |  |  |  |  |
Five Year First Lien Revolving Credit Facility | Revolving Credit Facility | Forecast |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  | 1.00% | 0.75% | 0.50% |  |  |  |  |  |
Five Year First Lien Revolving Credit Facility | Revolving Credit Facility | Term SOFR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 0.10% |  |  |  |  |  |  |  |  |  |
Five Year First Lien Revolving Credit Facility | Revolving Credit Facility | Daily Simple Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 0.10% |  |  |  |  |  |  |  |  |  |
Five Year First Lien Revolving Credit Facility | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.75% |  |  |  |  |  |  |  |  |
Five Year First Lien Revolving Credit Facility | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.50% |  |  |  |  |  |  |  |  |
Five Year First Lien Revolving Credit Facility | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 3.50% |  |  |  |  |  |  |  |  |
Five Year First Lien Revolving Credit Facility | Revolving Credit Facility | SFL Hercules Ltd |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 178 |  |  |  |  |  |  |  |  |
Five Year First Lien Revolving Credit Facility | Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 50 |  |  |  |  |  |  |  |  |  |
Five Year First Lien Revolving Credit Facility | Letter of Credit | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 100 |  |  |  |  |
Unsecured senior convertible bond | Convertible debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 50
Debt instrument, interest rate (as percent) |  |  |  |  |  |  |  |  |  |  | 6.00%
Debt conversion, converted instrument ratio |  | 0.0526316 |  |  |  |  |  |  |  |  |

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