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Debt - Additional Information (Details) - PREDECESSOR MILLROSE BUSINESS [Member] - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Debt | $ 24,188 | $ 32,607
Debt Instrument, Interest rate, Effective percentage | 0.00% |

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