XML 62 R18.htm IDEA: XBRL DOCUMENT
v3.25.2

Income Taxes (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
PREDECESSOR MILLROSE BUSINESS [Member] |
Income Tax Disclosure [Line Items] |
Schedule of Reconciliation of Statutory Rate and Effective Tax Rates | A reconciliation of the statutory rate and the effective tax rate was as follows:
|  | Percentage of Pretax Income |
| 2024 |  |  | 2023 |
Statutory rate |  |  | 21.0 | % |  |  | 21.0 | %
State income taxes (net of federal income tax benefit) |  |  | 4.3 | % |  |  | 4.3 | %
Valuation allowance |  |  | (25.3 | %) |  |  | (25.3 | %)
Effective rate |  |  | 0 | % |  |  | 0 | %

X
- Definition Income Tax Disclosure. + References No definition available. + Details
Name: | mrp_IncomeTaxDisclosureLineItems
Namespace Prefix: | mrp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=mrp_PredecessorMillroseBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |